head 1.1; branch 1.1.1; access; symbols netbsd-11-0-RC6:1.1.1.1.2.1 netbsd-11-0-RC5:1.1.1.1.2.1 netbsd-11-0-RC4:1.1.1.1.2.1 PFIX-3-11-2:1.1.1.2 netbsd-11-0-RC3:1.1.1.1 netbsd-11-0-RC2:1.1.1.1 netbsd-11-0-RC1:1.1.1.1 perseant-exfatfs:1.1.1.1.0.4 perseant-exfatfs-base-20250801:1.1.1.1 netbsd-11:1.1.1.1.0.2 netbsd-11-base:1.1.1.1 PFIX-3-10-1:1.1.1.1 VENEMA:1.1.1; locks; strict; comment @# @; 1.1 date 2025.02.25.19.11.36; author christos; state Exp; branches 1.1.1.1; next ; commitid cLFKwpXD6DqXOSKF; 1.1.1.1 date 2025.02.25.19.11.36; author christos; state Exp; branches 1.1.1.1.2.1 1.1.1.1.4.1; next 1.1.1.2; commitid cLFKwpXD6DqXOSKF; 1.1.1.2 date 2026.05.09.18.39.11; author christos; state Exp; branches; next ; commitid mtbvlXzNqJaszaFG; 1.1.1.1.2.1 date 2026.05.11.17.13.38; author martin; state Exp; branches; next ; commitid 2QeqaJm8KrXk4qFG; 1.1.1.1.4.1 date 2025.02.25.19.11.36; author perseant; state dead; branches; next 1.1.1.1.4.2; commitid 23j6GFaDws3O875G; 1.1.1.1.4.2 date 2025.08.02.05.49.51; author perseant; state Exp; branches; next ; commitid 23j6GFaDws3O875G; desc @@ 1.1 log @Initial revision @ text @ Postfix TLSRPT notification Howto

Postfix TLSRPT Howto

Introduction
Building Postfix with TLSRPT support
Turning on TLSRPT
TLSRPT Status logging
Delivering TLSRPT summaries via email
MTA-STS Support via smtp_tls_policy_maps
Limitations
Credits

Introduction

The TLSRPT protocol is defined in RFC 8460. With this, an email receiving domain can publish a policy in DNS, and request daily summary reports for successful and failed SMTP over TLS connections to that domain's MX hosts. Support for TLSRPT was added in Postfix 3.10.

A policy for domain example.com could look like this:

_smtp._tls.example.com. IN TXT "v=TLSRPTv1; rua=mailto:smtp-tls-report@@example.com"

Instead of mailto:, a policy may specify an https: destination.

The diagram below shows how Postfix TLS handshake success and failure events are collected and processed into daily summary reports.

Postfix SMTP and TLS client engines → TLSRPT client library (linked into Postfix) → TLSRPT collector, fetcher, and summary generator → Email or HTTP delivery

The Postfix SMTP and TLS client engines will generate a "success" or "failure" event for each TLS handshake,
They will pass those events to an in-process TLSRPT client library that sends data over a local socket to
A local TLSRPT collector that runs on each Postfix machine. A TLSRPT fetcher gathers information from individual collectors, and a central TLSRPT report generator produces daily summary reports.

The TLSRPT client library, and the infrastructure to collect, fetch, and report TLSRPT information, are implemented and maintained by sys4 at https://github.com/sys4/libtlsrpt and https://github.com/sys4/tlsrpt-reporter, respectively.

The Postfix implementation supports TLSRPT or domains with DANE (Postfix built-in) and MTA-STS (through an smtp_tls_policy_maps plug-in).

The Postfix smtp(8) client process implements the SMTP client engine. With "smtp_tls_connection_reuse = no", the smtp(8) client process also implements the TLS client engine. With "smtp_tls_connection_reuse = yes", the smtp(8) client process delegates TLS processing to a Postfix tlsproxy(8) process. Either way, Postfix will generate the exact same TLSRPT events.

Building Postfix with TLSRPT support

These instructions assume that you build Postfix from source code as described in the INSTALL document. Some modification may be required if you build Postfix from a vendor-specific source package.

The Postfix TLSRPT client builds on a TLSRPT library which may be available as a built package (rpm, deb, etc.), or which you can build from source code from:

https://github.com/sys4/libtlsrpt

The library is typically installed as a header file in /usr/local/include/tlsrpt.h and an object library in /usr/local/lib/libtlsrpt.a or /usr/local/lib/libtlsrpt.so. The actual pathnames will depend on OS platform conventions.

In order to build Postfix with TLSRPT support, you will need to add compiler options -DUSE_TLSRPT (to build with TLSRPT support) and -I (with the directory containing the tlsrpt.h header file), and you will need to add linker options to link with the TLSRPT client library, for example:

make -f Makefile.init makefiles \
  "CCARGS=-DUSE_TLSRPT -I/usr/local/include" \
  "AUXLIBS=-L/usr/local/lib -Wl,-rpath,/usr/local/lib -ltlsrpt"

(On Solaris systems you may need to use "-Wl,-R" instead of "-Wl,-rpath".)

Then, just run 'make'.

Note: if your build command line already has CCARGS or AUXLIBS settings, then simply append the above settings to the existing CCARGS or AUXLIBS values:
make -f Makefile.init makefiles \
  "CCARGS=... -DUSE_TLSRPT -I/usr/local/include" \
  "AUXLIBS=... -L/usr/local/lib -Wl,-rpath,/usr/local/lib -ltlsrpt"

Turning on TLSRPT

After installing Postfix TLSRPT support, you can enable TLSRPT support in main.cf like this:

smtp_tlsrpt_enable = yes
smtp_tlsrpt_socket_name = path/to/socket

The smtp_tlsrpt_socket_name parameter specifies either an absolute pathname, or a pathname that is relative to $queue_directory.

Notes:

The recommended socket location is still to be determined. A good socket location would be under the Postfix queue directory, for example: "smtp_tlsrpt_socket_name = run/tlsrpt/tlsrpt.sock". The advantage of using a relative name is that it will work equally well whether or not Postfix chroot is turned on.
Regardless of whether Postfix chroot is enabled, the TLSRPT receiver (tlsrpt_collectd) will need to be configured with the socket's absolute pathname.
Do not specify a TLSRPT socket location under a Postfix socket directory such as private or public. Only Postfix programs should create sockets there.

For details on how to run the TLSRPT collection and reporting infrastructure, see the documentation at https://github.com/sys4/tlsrpt-reporter.

TLSRPT Status logging

With TLSRPT support turned on, the Postfix TLSRPT client will not only report an event to an invisible daily success/fail summary queue, but it will also log a visible record to the mail logfile.

Below are a few examples of logging from a Postfix SMTP client or tlsproxy daemon:

TLSRPT: status=success, domain=example.com, receiving_mx=mail.example.com[ipaddr]
 
TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=starttls_not_supported
 
TLSRPT: status=failure, domain=example.net, receiving_mx=mail.example.net[ipaddr],
    failure_type=validation_failure, failure_reason=self-signed_certificate

Notes:

Postfix logs and reports the TLSRPT status only for TLS handshakes on a new SMTP connection. There is no TLS handshake, and thus no TLSRPT status logging, when an SMTP connection is reused. Such connections have Postfix SMTP client logging like this:

Verified TLS connection reused to mail.example.com[ipaddr]:25:
    TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
 
Untrusted TLS connection reused to mail.example.com[ipaddr]:25:
    TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)

By default, Postfix does not report the TLSRPT status for a TLS handshake that reuses a previously-negotiated TLS session (there would be no new information to report). Specify "smtp_tlsrpt_skip_reused_handshakes = no" to report the TLSRPT status for all TLS handshakes. This may be useful for troubleshooting.

Postfix logging for certificate verification failures may differ between new or reused TLS sessions.

New TLS session:

TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=validation_failure, failure_reason=self-signed_certificate

Reused TLS session:

mail.example.org[ipaddr]:25: re-using session with untrusted peer
    credential, look for details earlier in the log
TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=certificate_not_trusted

The logging may differ because a reused TLS session does not have the details for why TLS authentication failed.

Delivering TLSRPT summaries via email

RFC 8460 Section 3 specifies that an MTA must not enforce TLS security when sending failure reports via email.

Options:

In an email report, specify the "TLS-Required: no" message header, defined in RFC 8689, to reduce the Postfix SMTP client TLS security level to "may" (that is, do not verify remote SMTP server certificates, and fall back to plaintext if TLS is unavailable).

This feature is available in Postfix 3.10 and later. If your outbound MTAs run an older version, you can use one of the options described below.
Do nothing. When TLS security enforcement is required but fails, a TLSRPT summary message will be delayed until the problem is addressed, or until the message expires in the mail queue. Keep in mind that TLSRPT is not a real-time monitoring service; it takes on average 12 hours before a failure is reported through TLSRPT.

On outbound MTAs that don't support the "TLS-Required: no" header feature (such as Postfix 3.9 and earlier), disable TLS security enforcement for the sender of TLSRPT summaries. Implement the configuration below on outbound MTA instances (replace noreply-smtp-tls-reporting@@example.com with your actual report generator's sender address):

/etc/postfix/main.cf:
    # Limitation: this setting is overruled with transport_maps.
    sender_dependent_default_transport_maps = inline:{
        { noreply-smtp-tls-reporting@@example.com = allow-plaintext } }
 
/etc/postfix/master.cf:
    # service name    type    private unpriv  chroot  wakeup  maxproc command
    allow-plaintext   unix    -       -       -       -       -       smtp
        -o { smtp_tls_security_level = may }
        -o { smtp_tls_policy_maps = static:may }

MTA-STS Support via smtp_tls_policy_maps

Postfix supports MTA-STS though an smtp_tls_policy_maps policy plugin, which replies with a TLS security level and name=value attributes with certificate matching requirements. Postfix 3.10 and later extend the policy plugin response with additional name=value attributes that are needed for TLSRPT.

Examples of smtp_tls_policy_maps plugins with MTA-STS support are:

postfix-tlspol, supports domains with DANE (using Postfix built-in DANE), and domains with MTA-STS.
postfix-mta-sts-resolver, supports domains with MTA-STS as of release 1.5.0 (February 2025).

Both plugins can generate the additional name=value attributes that Postfix needs for TLSRPT support (as of February 2025). This is enabled by setting a tlsrpt boolean in a plugin configuration file. This setting is safe with Postfix 3.10 and later, even if Postfix TLSRPT support is disabled (at build time or at run time). Postfix versions 3.9 and earlier will report a policy error with "invalid attribute name".

The examples in the text below apply to this MTA-STS policy example given in RFC 8461 Section 3.2:

version: STSv1
mode: enforce
mx: mail.example.com
mx: *.example.net
mx: backupmx.example.com
max_age: 604800

The list of supported attributes is given below. Instead of name=value, specify { name = value } when a value may contain whitespace. A policy response may contain line breaks.

policy_type=type

Specify sts or no-policy-found.

Example: policy_type=sts
policy_domain=name

The domain that the MTA-STS policy applies to.

Example: policy_domain=example.com
{ policy_string = value }

Specify one policy_string instance for each MTA-STS policy feature, enclosed inside "{" and "}" to protect whitespace in attribute values.

Example: { policy_string = version: STSv1 } { policy_string = mode: enforce } ...

The above form ignores whitespace after the opening "{", around the "=", and before the closing "}".
mx_host_pattern=pattern

Specify one mx_host_pattern instance for each "mx:" feature in the MTA-STS policy.

Example: mx_host_pattern=mail.example.com mx_host_pattern=*.example.net ...
policy_failure=type

If specified, forces MTA-STS policy enforcement to fail with the indicated error, even if a server certificate would satisfy conventional PKI constraints. Valid errors are sts-policy-fetch-error, sts-policy-invalid, sts-webpki-invalid, or the less informative validation-failure.

Example: policy_failure=sts-webpki-invalid
policy_ttl=time (deprecated)

This attribute is deprecated. The time value is not used, and support for this attribute will eventually be removed from the code.

Notes:

Postfix 3.10 and later will accept these additional attributes in an MTA-STS response even if Postfix TLSRPT support is disabled (at build time or at run time). With Postfix TLSRPT support turned off, Postfix may still use the policy_failure attribute, and will ignore the attributes that are used only for TLSRPT.
It is an error to specify these attributes for a non-STS policy.

Limitations

The Postfix TLSRPT implementation reports only TLS handshake success or failure. It does not report failure to connect, or connections that break before or after a TLS handshake.

The Postfix TLSRPT implementation reports at most one final TLS handshake status (either 'success' or 'failure') per SMTP connection. Postfix TLSRPT will not report a recoverable failure and then later report a final status of 'success' for that same connection. The reason is that it's too complicated to filter TLS errors and to report error details from the TLS engine back to the SMTP protocol engine. It just is not how Postfix works internally.

Credits

The TLSRPT client library, and the infrastructure to collect, fetch, and report TLSRPT information, are implemented and maintained by sys4.
Wietse Venema implemented the integration with Postfix.

@ 1.1.1.1 log @Import postfix-3.10.1 (previous was 3.8.4) Summary: Postfix 3.9 (July 2022): This release focused on enhancing the TLS (Transport Layer Security) capabilities of Postfix. It introduced support for TLSv1.3, allowing for more secure and efficient encrypted communications. Additionally, improvements were made to the handling of TLSA records, which are used in DNS-based Authentication of Named Entities (DANE) to associate TLS certificates with domain names. Postfix 3.10 (July 2023): This version brought significant updates to Postfix's SMTP (Simple Mail Transfer Protocol) functionalities. It added support for the SMTPUTF8 extension, enabling the use of UTF-8 encoding in email addresses and headers, which is essential for internationalization. The release also included performance optimizations, particularly in the handling of large mail queues, and introduced new configuration parameters to provide administrators with finer control over mail processing. The changes are described more in detail in: 3.10 changes: RELEASE_NOTES 3.9 changes: RELEASE_NOTES_3.9 3.8 changes: RELEASE_NOTES_3.8 @ text @@ 1.1.1.1.2.1 log @Pull up the following, requested by christos in ticket #283: external/ibm-public/postfix//dist/README_FILES/NON_BERKELEYDB_README up to external/ibm-public/postfix//dist/README_FILES/REQUIRETLS_README up to external/ibm-public/postfix//dist/conf/postfix-non-bdb-script up to external/ibm-public/postfix//dist/html/NON_BERKELEYDB_README.html up to external/ibm-public/postfix//dist/html/REQUIRETLS_README.html up to external/ibm-public/postfix//dist/html/nbdb_reindexd.8.html up to external/ibm-public/postfix//dist/html/postfix-non-bdb.1.html up to external/ibm-public/postfix//dist/man/man1/postfix-non-bdb.1 up to external/ibm-public/postfix//dist/man/man8/nbdb_reindexd.8 up to external/ibm-public/postfix//dist/mantools/check-proxy-type-table up to external/ibm-public/postfix//dist/proto/NON_BERKELEYDB_README.html up to external/ibm-public/postfix//dist/proto/REQUIRETLS_README.html up to external/ibm-public/postfix//dist/src/cleanup/cleanup_message_test.c up to external/ibm-public/postfix//dist/src/global/ehlo_mask_test.c up to external/ibm-public/postfix//dist/src/global/nbdb_clnt.c up to external/ibm-public/postfix//dist/src/global/allowed_prefix.c up to external/ibm-public/postfix//dist/src/global/allowed_prefix.h up to external/ibm-public/postfix//dist/src/global/allowed_prefix_test.c up to external/ibm-public/postfix//dist/src/global/dict_sqlite_test.c up to external/ibm-public/postfix//dist/src/global/haproxy_srvr_test.c up to external/ibm-public/postfix//dist/src/global/login_sender_match_test.c up to external/ibm-public/postfix//dist/src/global/nbdb_clnt.h up to external/ibm-public/postfix//dist/src/global/nbdb_redirect.c up to external/ibm-public/postfix//dist/src/global/nbdb_redirect.h up to external/ibm-public/postfix//dist/src/global/nbdb_redirect_test.c up to 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external/ibm-public/postfix/dist/HISTORY up to 1.1.1.31 external/ibm-public/postfix/dist/INSTALL up to 1.1.1.11 external/ibm-public/postfix/dist/Makefile.in up to 1.1.1.12 external/ibm-public/postfix/dist/RELEASE_NOTES up to 1.1.1.19 external/ibm-public/postfix/dist/makedefs up to 1.18 external/ibm-public/postfix/dist/README_FILES/AAAREADME up to 1.1.1.8 external/ibm-public/postfix/dist/README_FILES/CDB_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/COMPATIBILITY_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/DATABASE_README up to 1.1.1.11 external/ibm-public/postfix/dist/README_FILES/DEPRECATION_README up to 1.1.1.2 external/ibm-public/postfix/dist/README_FILES/INSTALL up to 1.12 external/ibm-public/postfix/dist/README_FILES/MULTI_INSTANCE_README up to 1.1.1.8 external/ibm-public/postfix/dist/README_FILES/MYSQL_README up to 1.1.1.7 external/ibm-public/postfix/dist/README_FILES/OVERVIEW up to 1.1.1.7 external/ibm-public/postfix/dist/README_FILES/RELEASE_NOTES up to 1.1.1.19 external/ibm-public/postfix/dist/README_FILES/SASL_README up to 1.1.1.13 external/ibm-public/postfix/dist/README_FILES/SMTPUTF8_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/SOHO_README up to 1.1.1.6 external/ibm-public/postfix/dist/README_FILES/STANDARD_CONFIGURATION_README up to 1.1.1.8 external/ibm-public/postfix/dist/README_FILES/TLSRPT_README up to 1.1.1.2 external/ibm-public/postfix/dist/README_FILES/UUCP_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/VIRTUAL_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/XCLIENT_README up to 1.1.1.5 external/ibm-public/postfix/dist/conf/access up to 1.1.1.10 external/ibm-public/postfix/dist/conf/aliases up to 1.1.1.7 external/ibm-public/postfix/dist/conf/canonical up to 1.1.1.7 external/ibm-public/postfix/dist/conf/generic up to 1.1.1.6 external/ibm-public/postfix/dist/conf/main.cf up to 1.12 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external/ibm-public/postfix/dist/src/global/mail_conf.h up to 1.4 external/ibm-public/postfix/dist/src/global/mail_params.c up to 1.7 external/ibm-public/postfix/dist/src/global/mail_params.h up to 1.21 external/ibm-public/postfix/dist/src/global/mail_proto.h up to 1.7 external/ibm-public/postfix/dist/src/global/mail_version.h up to 1.8 external/ibm-public/postfix/dist/src/global/maps.c up to 1.6 external/ibm-public/postfix/dist/src/global/mime_garb3.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/global/mime_state.c up to 1.4 external/ibm-public/postfix/dist/src/global/mime_state.h up to 1.2 external/ibm-public/postfix/dist/src/global/mynetworks.c up to 1.3 external/ibm-public/postfix/dist/src/global/namadr_list.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/global/namadr_list.ref up to 1.1.1.6 external/ibm-public/postfix/dist/src/global/own_inet_addr.c up to 1.3 external/ibm-public/postfix/dist/src/global/pipe_command.c up to 1.3 external/ibm-public/postfix/dist/src/global/post_mail.c up to 1.6 external/ibm-public/postfix/dist/src/global/rec_type.h up to 1.5 external/ibm-public/postfix/dist/src/global/reject_deliver_request.c up to 1.3 external/ibm-public/postfix/dist/src/global/rfc2047_code.c up to 1.3 external/ibm-public/postfix/dist/src/global/rfc2047_code.h up to 1.3 external/ibm-public/postfix/dist/src/global/sendopts.c up to 1.3 external/ibm-public/postfix/dist/src/global/sent.c up to 1.4 external/ibm-public/postfix/dist/src/global/sent.h up to 1.3 external/ibm-public/postfix/dist/src/global/server_acl.c up to 1.5 external/ibm-public/postfix/dist/src/global/trace.c up to 1.4 external/ibm-public/postfix/dist/src/global/trace.h up to 1.2 external/ibm-public/postfix/dist/src/global/verify.c up to 1.5 external/ibm-public/postfix/dist/src/global/verify.h up to 1.2 external/ibm-public/postfix/dist/src/local/Makefile.in up to 1.1.1.10 external/ibm-public/postfix/dist/src/local/forward.c up to 1.6 external/ibm-public/postfix/dist/src/local/local.c up to 1.6 external/ibm-public/postfix/dist/src/local/local.h up to 1.4 external/ibm-public/postfix/dist/src/master/Makefile.in up to 1.1.1.9 external/ibm-public/postfix/dist/src/master/event_server.c up to 1.5 external/ibm-public/postfix/dist/src/master/multi_server.c up to 1.5 external/ibm-public/postfix/dist/src/milter/milter8.c up to 1.7 external/ibm-public/postfix/dist/src/milter/test-milter.c up to 1.5 external/ibm-public/postfix/dist/src/oqmgr/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/oqmgr/qmgr.c up to 1.4 external/ibm-public/postfix/dist/src/oqmgr/qmgr_bounce.c up to 1.2 external/ibm-public/postfix/dist/src/oqmgr/qmgr_defer.c up to 1.2 external/ibm-public/postfix/dist/src/oqmgr/qmgr_message.c up to 1.6 external/ibm-public/postfix/dist/src/pipe/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/pipe/pipe.c up to 1.6 external/ibm-public/postfix/dist/src/postalias/Makefile.in up to 1.1.1.8 external/ibm-public/postfix/dist/src/postalias/postalias.c up to 1.7 external/ibm-public/postfix/dist/src/postcat/postcat.c up to 1.6 external/ibm-public/postfix/dist/src/postconf/Makefile.in up to 1.1.1.13 external/ibm-public/postfix/dist/src/postconf/extract.awk up to 1.1.1.7 external/ibm-public/postfix/dist/src/postconf/postconf.c up to 1.6 external/ibm-public/postfix/dist/src/postconf/postconf.h up to 1.6 external/ibm-public/postfix/dist/src/postconf/postconf_builtin.c up to 1.5 external/ibm-public/postfix/dist/src/postconf/postconf_dbms.c up to 1.7 external/ibm-public/postfix/dist/src/postconf/postconf_edit.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf_lookup.c up to 1.5 external/ibm-public/postfix/dist/src/postconf/postconf_main.c up to 1.5 external/ibm-public/postfix/dist/src/postconf/postconf_master.c up to 1.9 external/ibm-public/postfix/dist/src/postconf/postconf_unused.c up to 1.3 external/ibm-public/postfix/dist/src/postconf/postconf_user.c up to 1.6 external/ibm-public/postfix/dist/src/postconf/test18.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test2.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test28.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/postconf/test29.ref up to 1.1.1.5 external/ibm-public/postfix/dist/src/postconf/test57.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test59.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/postconf/test67.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/postconf/test76.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postdrop/postdrop.c up to 1.6 external/ibm-public/postfix/dist/src/postfix/postfix.c up to 1.8 external/ibm-public/postfix/dist/src/postlog/postlog.c up to 1.7 external/ibm-public/postfix/dist/src/postmap/Makefile.in up to 1.1.1.9 external/ibm-public/postfix/dist/src/postmap/postmap.c up to 1.7 external/ibm-public/postfix/dist/src/postmulti/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/postmulti/postmulti.c up to 1.5 external/ibm-public/postfix/dist/src/postqueue/postqueue.c up to 1.6 external/ibm-public/postfix/dist/src/postqueue/showq_compat.c up to 1.5 external/ibm-public/postfix/dist/src/postqueue/showq_json.c up to 1.6 external/ibm-public/postfix/dist/src/postscreen/postscreen.c up to 1.7 external/ibm-public/postfix/dist/src/postscreen/postscreen_endpt.c up to 1.6 external/ibm-public/postfix/dist/src/posttls-finger/posttls-finger.c up to 1.7 external/ibm-public/postfix/dist/src/proxymap/Makefile.in up to 1.1.1.8 external/ibm-public/postfix/dist/src/proxymap/proxymap.c up to 1.6 external/ibm-public/postfix/dist/src/qmgr/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/qmgr/qmgr.c up to 1.5 external/ibm-public/postfix/dist/src/qmgr/qmgr_bounce.c up to 1.2 external/ibm-public/postfix/dist/src/qmgr/qmgr_defer.c up to 1.2 external/ibm-public/postfix/dist/src/qmgr/qmgr_message.c up to 1.6 external/ibm-public/postfix/dist/src/sendmail/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/sendmail/sendmail.c up to 1.6 external/ibm-public/postfix/dist/src/showq/showq.c up to 1.6 external/ibm-public/postfix/dist/src/smtp/Makefile.in up to 1.1.1.12 external/ibm-public/postfix/dist/src/smtp/lmtp_params.c up to 1.7 external/ibm-public/postfix/dist/src/smtp/smtp.c up to 1.15 external/ibm-public/postfix/dist/src/smtp/smtp.h up to 1.7 external/ibm-public/postfix/dist/src/smtp/smtp_connect.c up to 1.7 external/ibm-public/postfix/dist/src/smtp/smtp_key.c up to 1.4 external/ibm-public/postfix/dist/src/smtp/smtp_params.c up to 1.7 external/ibm-public/postfix/dist/src/smtp/smtp_proto.c up to 1.7 external/ibm-public/postfix/dist/src/smtp/smtp_rcpt.c up to 1.4 external/ibm-public/postfix/dist/src/smtp/smtp_state.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_tls_policy.c up to 1.6 external/ibm-public/postfix/dist/src/smtp/smtp_tlsrpt.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_trouble.c up to 1.4 external/ibm-public/postfix/dist/src/smtpd/Makefile.in up to 1.1.1.13 external/ibm-public/postfix/dist/src/smtpd/smtpd.c up to 1.22 external/ibm-public/postfix/dist/src/smtpd/smtpd.h up to 1.7 external/ibm-public/postfix/dist/src/smtpd/smtpd_chat.c up to 1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.c up to 1.8 external/ibm-public/postfix/dist/src/smtpd/smtpd_haproxy.c up to 1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_peer.c up to 1.6 external/ibm-public/postfix/dist/src/smtpd/smtpd_proxy.c up to 1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_proxy.h up to 1.2 external/ibm-public/postfix/dist/src/tls/Makefile.in up to 1.1.1.12 external/ibm-public/postfix/dist/src/tls/tls.h up to 1.7 external/ibm-public/postfix/dist/src/tls/tls_client.c up to 1.15 external/ibm-public/postfix/dist/src/tls/tls_dane.c up to 1.7 external/ibm-public/postfix/dist/src/tls/tls_dane.sh up to 1.1.1.2 external/ibm-public/postfix/dist/src/tls/tls_dh.c up to 1.7 external/ibm-public/postfix/dist/src/tls/tls_misc.c up to 1.7 external/ibm-public/postfix/dist/src/tls/tls_prng_file.c up to 1.3 external/ibm-public/postfix/dist/src/tls/tls_proxy.h up to 1.6 external/ibm-public/postfix/dist/src/tls/tls_proxy_client_misc.c up to 1.5 external/ibm-public/postfix/dist/src/tls/tls_proxy_client_print.c up to 1.6 external/ibm-public/postfix/dist/src/tls/tls_proxy_client_scan.c up to 1.6 external/ibm-public/postfix/dist/src/tls/tls_server.c up to 1.14 external/ibm-public/postfix/dist/src/tls/tls_verify.c up to 1.6 external/ibm-public/postfix/dist/src/tls/tlsrpt_wrapper.c up to 1.3 external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy.c up to 1.8 external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy_state.c up to 1.4 external/ibm-public/postfix/dist/src/trivial-rewrite/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/trivial-rewrite/resolve.c up to 1.6 external/ibm-public/postfix/dist/src/trivial-rewrite/trivial-rewrite.c up to 1.6 external/ibm-public/postfix/dist/src/util/Makefile.in up to 1.1.1.13 external/ibm-public/postfix/dist/src/util/alldig.c up to 1.4 external/ibm-public/postfix/dist/src/util/argv.c up to 1.6 external/ibm-public/postfix/dist/src/util/argv.h up to 1.6 external/ibm-public/postfix/dist/src/util/dict.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict.h up to 1.7 external/ibm-public/postfix/dist/src/util/dict_alloc.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_cache.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_cache.h up to 1.3 external/ibm-public/postfix/dist/src/util/dict_cdb.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_cidr.c up to 1.6 external/ibm-public/postfix/dist/src/util/dict_db.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_dbm.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_debug.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_env.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_fail.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_inline.c up to 1.6 external/ibm-public/postfix/dist/src/util/dict_lmdb.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_ni.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_nis.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_nisplus.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_open.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_pcre.c up to 1.6 external/ibm-public/postfix/dist/src/util/dict_pipe.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_random.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_regexp.c up to 1.6 external/ibm-public/postfix/dist/src/util/dict_sdbm.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_seq.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dict_sockmap.c up to 1.7 external/ibm-public/postfix/dist/src/util/dict_static.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_surrogate.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_tcp.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_test.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_thash.c up to 1.6 external/ibm-public/postfix/dist/src/util/dict_union.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_unix.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_utf8_test.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/hash_fnv.c up to 1.5 external/ibm-public/postfix/dist/src/util/hex_code.c up to 1.5 external/ibm-public/postfix/dist/src/util/hex_code.h up to 1.6 external/ibm-public/postfix/dist/src/util/htable.c up to 1.5 external/ibm-public/postfix/dist/src/util/inet_addr_list.c up to 1.3 external/ibm-public/postfix/dist/src/util/inet_prefix_top.c up to 1.4 external/ibm-public/postfix/dist/src/util/inet_proto.c up to 1.5 external/ibm-public/postfix/dist/src/util/mac_expand.c up to 1.5 external/ibm-public/postfix/dist/src/util/mac_expand.h up to 1.6 external/ibm-public/postfix/dist/src/util/mac_expand.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/util/mac_expand.ref up to 1.1.1.5 external/ibm-public/postfix/dist/src/util/match_list.c up to 1.4 external/ibm-public/postfix/dist/src/util/midna_domain.c up to 1.6 external/ibm-public/postfix/dist/src/util/mkmap_open.c up to 1.3 external/ibm-public/postfix/dist/src/util/msg_vstream.c up to 1.2 external/ibm-public/postfix/dist/src/util/myaddrinfo.c up to 1.4 external/ibm-public/postfix/dist/src/util/myaddrinfo.h up to 1.5 external/ibm-public/postfix/dist/src/util/myaddrinfo.ref up to 1.1.1.6 external/ibm-public/postfix/dist/src/util/myaddrinfo.ref2 up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/myaddrinfo4.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/myaddrinfo4.ref2 up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/myflock.c up to 1.4 external/ibm-public/postfix/dist/src/util/name_mask.c up to 1.5 external/ibm-public/postfix/dist/src/util/name_mask.h up to 1.2 external/ibm-public/postfix/dist/src/util/name_mask.ref5 up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/name_mask.ref6 up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/netstring.c up to 1.5 external/ibm-public/postfix/dist/src/util/normalize_ws.c up to 1.3 external/ibm-public/postfix/dist/src/util/open_as.c up to 1.2 external/ibm-public/postfix/dist/src/util/open_as.h up to 1.2 external/ibm-public/postfix/dist/src/util/quote_for_json.c up to 1.3 external/ibm-public/postfix/dist/src/util/sane_sockaddr_to_hostaddr.c up to 1.3 external/ibm-public/postfix/dist/src/util/spawn_command.c up to 1.4 external/ibm-public/postfix/dist/src/util/spawn_command.h up to 1.3 external/ibm-public/postfix/dist/src/util/stringops.h up to 1.7 external/ibm-public/postfix/dist/src/util/sys_defs.h up to 1.16 external/ibm-public/postfix/dist/src/util/unescape.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/vbuf_print.c up to 1.6 external/ibm-public/postfix/dist/src/util/vbuf_print_test.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/vbuf_print_test.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/vstream.c up to 1.6 external/ibm-public/postfix/dist/src/util/vstream.h up to 1.5 external/ibm-public/postfix/dist/src/util/vstring.c up to 1.5 external/ibm-public/postfix/dist/src/util/vstring_vstream.c up to 1.3 external/ibm-public/postfix/dist/src/verify/verify.c up to 1.6 external/ibm-public/postfix/dist/src/virtual/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/virtual/virtual.c up to 1.5 external/ibm-public/postfix/dist/src/virtual/virtual.h up to 1.2 external/ibm-public/postfix/dist/src/xsasl/xsasl_dovecot_server.c up to 1.6 external/ibm-public/postfix/lib/global/Makefile up to 1.12 external/ibm-public/postfix/lib/util/Makefile up to 1.13 external/ibm-public/postfix/libexec/smtp/Makefile up to 1.5 doc/3RDPARTY (manually edited) Import Postfix 3.11.2. @ text @a27 1

Connection reuse versus session resumption

d55 2 a56 2

The diagram below shows how successful or failed Postfix TLS handshake events are collected and processed into daily summary d102 1 a102 1

The Postfix implementation supports TLSRPT for domains with DANE a205 43

Connection reuse versus session resumption

The Postfix SMTP client implements two kinds of reuse:

SMTP Connection reuse: a Postfix SMTP client creates a new SMTP connection, sends one email message, and saves the connection instead of closing it. Later, some SMTP client reuses that connection, sends an email message, and saves or closes the connection depending on whether it has reached some reuse limit. Each connection can be used by only one Postfix SMTP client at a time.
TLS Session resumption: a Postfix SMTP client saves the result from a "new" TLS handshake. Later, one or more SMTP clients create a new SMTP connection and resume the saved TLS session on their new connection.

Of course there is a third case:

Combined reuse and resumption: a Postfix SMTP client creates a new SMTP connection, sends one email message, saves the result from a "new" TLS handshake, and also saves the connection instead of closing it. Later, one SMTP client reuses (and saves) that connection, one client at a time, and one or more clients create a new SMTP connection and resume the saved TLS session on their new connection.

In all cases, there is no TLS handshake when a saved SMTP connection is reused, and there is no "new" TLS handshake when a saved TLS session is resumed.

As described next, Postfix will by default log and generate only a TLSRPT event for a "new" TLS handshake.

d245 6 a250 6

With TLSRPT enabled, the Postfix SMTP client reports the TLSRPT status for all TLS handshakes (the default as of Postfix 3.11). Specify "smtp_tlsrpt_skip_reused_handshakes = yes" (the default with Postfix 3.10) to skip reporting TLS handshakes that reuse a previously-negotiated TLS session as there would be no new information to report.

d332 1 a332 1

Postfix supports MTA-STS through an smtp_tls_policy_maps policy @ 1.1.1.2 log @Import postfix 3.11.2 (previous was 3.10.1) Changes in 3.11.2 Bugfix (defect introduced: Postfix 3.11): the proxymap(8) daemon dereferenced an uninitialized pointer after a request protocol error. This daemon is not exposed to local or remote users. Found by Claude Opus 4.6. Bugfix (defect introduced: 20260309) a change, to set the service_name default value to "amnesiac", violated a test that parameter names in postconf output must match 1:1 with parameter names in the postlink script. Changes in 3.11.1 Bugfix (defect introduced: 20260219): alias_maps errors when default_database_type was not set in main.cf. Fix by Michael Tokarev. Bugfix (defect introduced: Postfix 3.0): buffer over-read when Postfix is configured with an enhanced status code not followed by other text. For example, "5.7.2" without text after the three-number code, in an access(5) table, header or body checks, or with "$rbl_code $rbl_text" in rbl_reply_maps or default_rbl_reply. These are all uncommon configurations. Problem reported by Kamil Frankowicz. Bugfix (defect introduced: Postfix 3.3): null pointer in nbdb_reindexd(8) because the "service_name" value was not propagated. Report by Michael Tokarev. During Postfix start-up, avoid a spurious error message from nbdb_reindexd(8), when non_bdb_migration_level disables automatic re-indexing. Changes in 3.11.0 Postfix stable release 3.11.0 is available. Postfix 3.7 - 3.10 were updated a few weeks ago; after that, Postfix 3.7 will no longer be updated. The main changes are below. See the RELEASE_NOTES file for further details. Berkeley DB migration: Some (Linux) distributions are removing support for BerkeleyDB databases (In Postfix, this means we lose support for the hash: and btree: lookup tables). See NON_BERKELEYDB_README for manual and partially automatic migration from btree: to lmdb:, and from hash: to lmdb: or cdb:. The loss of BerkeleyDB affects Mailman versions that want to execute commands like "postmap hash:/path/to/file" when a mailing list is added or removed. Postfix provides a way to redirect such commands to a supported database type. You don't have to wait until BerkeleyDB support is removed. It can make sense to migrate while BerkeleyDB support is still available (mainly, less downtime). Changes in TLS support: Default TLS security. The Postfix SMTP client smtp_tls_security_level default value is "may" if Postfix was built with TLS support, and the compatibility_level is 3.11 or higher. Support for the RFC 8689 "REQUIRETLS" verb in ESMTP. This requires that every SMTP (and LMTP) server in the forward path is strongly authenticated with DANE, STS, or equivalent, and that every server announces REQUIRETLS support. See REQUIRETLS_README for suggestions to carefully enforce REQUIRETLS without causing massive mail delivery problems. Logging the TLS security level. This shows the desired and actual TLS security level enforcement status and, if a message requests REQUIRETLS, the REQUIRETLS policy enforcement status. For a list of examples see smtp_log_tls_feature_status Workaround for an interface mismatch between the Postfix SMTP client and MTA-STS policy plugins. This introduces a new parameter smtp_tls_enforce_sts_mx_patterns (default: "yes"). The MTA-STS plugin configuration needs to enable TLSRPT support, so that it forwards STS policy attributes to Postfix. Both postfix-tlspol and postfix-mta-sts-resolver have been updated accordingly. With this, the Postfix SMTP client will connect to an MX host only if its name matches any STS policy MX host pattern, and will match a server certificate against the MX hostname. Otherwise, the old behavior stays in effect: connect to any MX host listed in DNS, and match a server certificate against any STS policy MX host pattern. Post-quantum cryptography support. With OpenSSL 3.5 and later, change the tls_eecdh_auto_curves default value to avoid problems with network infrastructure that mishandles TLS hello messages larger than one (Ethernet) TCP segment. This problem is more generally known as "protocol ossification". Miscellaneous changes: Deprecation of obsolete parameters. Postfix programs log a warning that these parameters will be removed. See DEPRECATION_README for a list of deprecated parameters. JSON output support with "postconf -j|-jM|-jF|-jP", "postalias -jq|-js", "postmap -jq|-js", and "postmulti -jl". No support is planned for JSON input support. Milter support: improved Milter error handling for messages that arrive over a long-lived SMTP connection, by changing the default milter_default_action from "tempfail" to the new "shutdown" action (i.e. disconnect the remote SMTP client). This was already back-ported to earlier stable releases. For more changes in the 3.10 branch see: https://www.postfix.org/announcements.html @ text @a27 1

Connection reuse versus session resumption

d55 2 a56 2

The diagram below shows how successful or failed Postfix TLS handshake events are collected and processed into daily summary d102 1 a102 1

The Postfix implementation supports TLSRPT for domains with DANE a205 43

Connection reuse versus session resumption

The Postfix SMTP client implements two kinds of reuse:

SMTP Connection reuse: a Postfix SMTP client creates a new SMTP connection, sends one email message, and saves the connection instead of closing it. Later, some SMTP client reuses that connection, sends an email message, and saves or closes the connection depending on whether it has reached some reuse limit. Each connection can be used by only one Postfix SMTP client at a time.
TLS Session resumption: a Postfix SMTP client saves the result from a "new" TLS handshake. Later, one or more SMTP clients create a new SMTP connection and resume the saved TLS session on their new connection.

Of course there is a third case:

Combined reuse and resumption: a Postfix SMTP client creates a new SMTP connection, sends one email message, saves the result from a "new" TLS handshake, and also saves the connection instead of closing it. Later, one SMTP client reuses (and saves) that connection, one client at a time, and one or more clients create a new SMTP connection and resume the saved TLS session on their new connection.

In all cases, there is no TLS handshake when a saved SMTP connection is reused, and there is no "new" TLS handshake when a saved TLS session is resumed.

As described next, Postfix will by default log and generate only a TLSRPT event for a "new" TLS handshake.

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Postfix supports MTA-STS through an smtp_tls_policy_maps policy @ 1.1.1.1.4.1 log @file TLSRPT_README.html was added on branch perseant-exfatfs on 2025-08-02 05:49:51 +0000 @ text @d1 481 @ 1.1.1.1.4.2 log @Sync with HEAD @ text @a0 481 Postfix TLSRPT notification Howto

Postfix TLSRPT Howto

Introduction
Building Postfix with TLSRPT support
Turning on TLSRPT
TLSRPT Status logging
Delivering TLSRPT summaries via email
MTA-STS Support via smtp_tls_policy_maps
Limitations
Credits

Introduction

A policy for domain example.com could look like this:

_smtp._tls.example.com. IN TXT "v=TLSRPTv1; rua=mailto:smtp-tls-report@@example.com"

Instead of mailto:, a policy may specify an https: destination.

The diagram below shows how Postfix TLS handshake success and failure events are collected and processed into daily summary reports.

Postfix SMTP and TLS client engines → TLSRPT client library (linked into Postfix) → TLSRPT collector, fetcher, and summary generator → Email or HTTP delivery

The Postfix SMTP and TLS client engines will generate a "success" or "failure" event for each TLS handshake,
They will pass those events to an in-process TLSRPT client library that sends data over a local socket to
A local TLSRPT collector that runs on each Postfix machine. A TLSRPT fetcher gathers information from individual collectors, and a central TLSRPT report generator produces daily summary reports.

The Postfix implementation supports TLSRPT or domains with DANE (Postfix built-in) and MTA-STS (through an smtp_tls_policy_maps plug-in).

Building Postfix with TLSRPT support

These instructions assume that you build Postfix from source code as described in the INSTALL document. Some modification may be required if you build Postfix from a vendor-specific source package.

The Postfix TLSRPT client builds on a TLSRPT library which may be available as a built package (rpm, deb, etc.), or which you can build from source code from:

https://github.com/sys4/libtlsrpt

make -f Makefile.init makefiles \
  "CCARGS=-DUSE_TLSRPT -I/usr/local/include" \
  "AUXLIBS=-L/usr/local/lib -Wl,-rpath,/usr/local/lib -ltlsrpt"

(On Solaris systems you may need to use "-Wl,-R" instead of "-Wl,-rpath".)

Then, just run 'make'.

Note: if your build command line already has CCARGS or AUXLIBS settings, then simply append the above settings to the existing CCARGS or AUXLIBS values:
make -f Makefile.init makefiles \
  "CCARGS=... -DUSE_TLSRPT -I/usr/local/include" \
  "AUXLIBS=... -L/usr/local/lib -Wl,-rpath,/usr/local/lib -ltlsrpt"

Turning on TLSRPT

After installing Postfix TLSRPT support, you can enable TLSRPT support in main.cf like this:

smtp_tlsrpt_enable = yes
smtp_tlsrpt_socket_name = path/to/socket

The smtp_tlsrpt_socket_name parameter specifies either an absolute pathname, or a pathname that is relative to $queue_directory.

Notes:

The recommended socket location is still to be determined. A good socket location would be under the Postfix queue directory, for example: "smtp_tlsrpt_socket_name = run/tlsrpt/tlsrpt.sock". The advantage of using a relative name is that it will work equally well whether or not Postfix chroot is turned on.
Regardless of whether Postfix chroot is enabled, the TLSRPT receiver (tlsrpt_collectd) will need to be configured with the socket's absolute pathname.
Do not specify a TLSRPT socket location under a Postfix socket directory such as private or public. Only Postfix programs should create sockets there.

For details on how to run the TLSRPT collection and reporting infrastructure, see the documentation at https://github.com/sys4/tlsrpt-reporter.

TLSRPT Status logging

With TLSRPT support turned on, the Postfix TLSRPT client will not only report an event to an invisible daily success/fail summary queue, but it will also log a visible record to the mail logfile.

Below are a few examples of logging from a Postfix SMTP client or tlsproxy daemon:

TLSRPT: status=success, domain=example.com, receiving_mx=mail.example.com[ipaddr]
 
TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=starttls_not_supported
 
TLSRPT: status=failure, domain=example.net, receiving_mx=mail.example.net[ipaddr],
    failure_type=validation_failure, failure_reason=self-signed_certificate

Notes:

Verified TLS connection reused to mail.example.com[ipaddr]:25:
    TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
 
Untrusted TLS connection reused to mail.example.com[ipaddr]:25:
    TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)

By default, Postfix does not report the TLSRPT status for a TLS handshake that reuses a previously-negotiated TLS session (there would be no new information to report). Specify "smtp_tlsrpt_skip_reused_handshakes = no" to report the TLSRPT status for all TLS handshakes. This may be useful for troubleshooting.

Postfix logging for certificate verification failures may differ between new or reused TLS sessions.

New TLS session:

TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=validation_failure, failure_reason=self-signed_certificate

Reused TLS session:

mail.example.org[ipaddr]:25: re-using session with untrusted peer
    credential, look for details earlier in the log
TLSRPT: status=failure, domain=example.org, receiving_mx=mail.example.org[ipaddr],
    failure_type=certificate_not_trusted

The logging may differ because a reused TLS session does not have the details for why TLS authentication failed.

Delivering TLSRPT summaries via email

RFC 8460 Section 3 specifies that an MTA must not enforce TLS security when sending failure reports via email.

Options:

In an email report, specify the "TLS-Required: no" message header, defined in RFC 8689, to reduce the Postfix SMTP client TLS security level to "may" (that is, do not verify remote SMTP server certificates, and fall back to plaintext if TLS is unavailable).

This feature is available in Postfix 3.10 and later. If your outbound MTAs run an older version, you can use one of the options described below.
Do nothing. When TLS security enforcement is required but fails, a TLSRPT summary message will be delayed until the problem is addressed, or until the message expires in the mail queue. Keep in mind that TLSRPT is not a real-time monitoring service; it takes on average 12 hours before a failure is reported through TLSRPT.

/etc/postfix/main.cf:
    # Limitation: this setting is overruled with transport_maps.
    sender_dependent_default_transport_maps = inline:{
        { noreply-smtp-tls-reporting@@example.com = allow-plaintext } }
 
/etc/postfix/master.cf:
    # service name    type    private unpriv  chroot  wakeup  maxproc command
    allow-plaintext   unix    -       -       -       -       -       smtp
        -o { smtp_tls_security_level = may }
        -o { smtp_tls_policy_maps = static:may }

MTA-STS Support via smtp_tls_policy_maps

Examples of smtp_tls_policy_maps plugins with MTA-STS support are:

postfix-tlspol, supports domains with DANE (using Postfix built-in DANE), and domains with MTA-STS.
postfix-mta-sts-resolver, supports domains with MTA-STS as of release 1.5.0 (February 2025).

The examples in the text below apply to this MTA-STS policy example given in RFC 8461 Section 3.2:

version: STSv1
mode: enforce
mx: mail.example.com
mx: *.example.net
mx: backupmx.example.com
max_age: 604800

The list of supported attributes is given below. Instead of name=value, specify { name = value } when a value may contain whitespace. A policy response may contain line breaks.

policy_type=type

Specify sts or no-policy-found.

Example: policy_type=sts
policy_domain=name

The domain that the MTA-STS policy applies to.

Example: policy_domain=example.com
{ policy_string = value }

Specify one policy_string instance for each MTA-STS policy feature, enclosed inside "{" and "}" to protect whitespace in attribute values.

Example: { policy_string = version: STSv1 } { policy_string = mode: enforce } ...

The above form ignores whitespace after the opening "{", around the "=", and before the closing "}".
mx_host_pattern=pattern

Specify one mx_host_pattern instance for each "mx:" feature in the MTA-STS policy.

Example: mx_host_pattern=mail.example.com mx_host_pattern=*.example.net ...
policy_failure=type

If specified, forces MTA-STS policy enforcement to fail with the indicated error, even if a server certificate would satisfy conventional PKI constraints. Valid errors are sts-policy-fetch-error, sts-policy-invalid, sts-webpki-invalid, or the less informative validation-failure.

Example: policy_failure=sts-webpki-invalid
policy_ttl=time (deprecated)

This attribute is deprecated. The time value is not used, and support for this attribute will eventually be removed from the code.

Notes:

Postfix 3.10 and later will accept these additional attributes in an MTA-STS response even if Postfix TLSRPT support is disabled (at build time or at run time). With Postfix TLSRPT support turned off, Postfix may still use the policy_failure attribute, and will ignore the attributes that are used only for TLSRPT.
It is an error to specify these attributes for a non-STS policy.

Limitations

The Postfix TLSRPT implementation reports only TLS handshake success or failure. It does not report failure to connect, or connections that break before or after a TLS handshake.

Credits

The TLSRPT client library, and the infrastructure to collect, fetch, and report TLSRPT information, are implemented and maintained by sys4.
Wietse Venema implemented the integration with Postfix.

Postfix TLSRPT Howto

Table of Contents

Introduction

Building Postfix with TLSRPT support

Turning on TLSRPT

TLSRPT Status logging

Delivering TLSRPT summaries via email

MTA-STS Support via smtp_tls_policy_maps

Limitations

Credits

Connection reuse versus session resumption

Connection reuse versus session resumption

Postfix TLSRPT Howto

Table of Contents

Introduction

Building Postfix with TLSRPT support

Turning on TLSRPT

TLSRPT Status logging

Delivering TLSRPT summaries via email

MTA-STS Support via smtp_tls_policy_maps

Limitations

Credits