====== 2025.03.02 Postfix Logging Headers to Log ======

===== Postfix Configuration Change (Incoming Mail) =====

<code|/etc/postfix/header_checks.pcre>
/^From: (.*)/    WARN From Header: $1
/^To: (.*)/    WARN To Header: $1
/^Cc: (.*)/ WARN Cc Header: $1
</code>

<code|/etc/postfix/main.cf>
header_checks = pcre:/etc/postfix/header_checks.pcre
</code>

===== Heading =====

Headers are logged like this

From: aaa@hogehoge.com
To: bbb@hoge.jp
Cc: ccc@hogehoge.com

<code>
2025-03-02T10:41:31.581092+09:00 mail postfix/cleanup[1060]: 75B1DA03B5: warning: header From: "aaa@hogehoge.com" <aaa@hogehoge.com> from hoge.hogehoge.com[xx.xxx.xx.xx]; from=<aaa@hogehoge.com> to=<bbb@hoge.jp> proto=ESMTP helo=<hoge.hogehoge.com>: From Header: "aaa@hogehoge.com" <aaa@hogehoge.com>
2025-03-02T10:41:31.581236+09:00 mail postfix/cleanup[1060]: 75B1DA03B5: warning: header To: =?iso-2022-jp?B?GyRCPy5MbxsoQiAbJEI+PjBmGyhC?= <bbb@hoge.jp> from hoge.hogehoge.com[xx.xx.xx.xx]; from=<aaa@hogehoge.com> to=<bbb@hoge.jp> proto=ESMTP helo=<hoge.hogehoge.com>: To Header: =?iso-2022-jp?B?GyRCPy5MbxsoQiAbJEI+PjBmGyhC?= <bbb@hoge.jp>
2025-03-02T10:41:31.581360+09:00 mail postfix/cleanup[1060]: 75B1DA03B5: warning: header CC: "ccc@hogehoge.com" <ccc@hogehoge.com> from hoge.hogehoge.com[xx.xx.xx.xx]; from=<aaa@hogehoge.com> to=<bbb@hoge.jp> proto=ESMTP helo=<hoge.hogehoge.com>: Cc Header: "ccc@hogehoge.com" <ccc@hogehoge.com>
</code>

===== For Logging Outgoing Mail =====

Add the following to /etc/postfix/maps/sender_header_filter.pcre
<code|/etc/postfix/maps/sender_header_filter.pcre>
/^From: (.*)/    WARN From Header: $1
/^To: (.*)/    WARN To Header: $1
/^Cc: (.*)/ WARN Cc Header: $1
</code>

<code|/etc/postfix/main.cf>
smtp_header_checks = pcre:/etc/postfix/maps/sender_header_filter.pcre
</code>


===== For Docker MailServer =====

For [[06_virtualization:05_container:04_docker_mailserver]]

=== First, Copy the Files ===

<code>
docker-compose cp mailserver:/etc/postfix/maps/sender_header_filter.pcre ./docker-data/dms/config/
</code>

==== compose.yaml ====

<code|compose.yaml>
    volumes:
      - ./docker-data/dms/config/header_checks.pcre:/etc/postfix/header_checks.pcre
      - ./docker-data/dms/config/sender_header_filter.pcre:/etc/postfix/maps/sender_header_filter.pcre
</code>

<code|./docker-data/dms/config/postfix-main.cf>
header_checks = pcre:/etc/postfix/header_checks.pcre
</code>

=== Verify the Configuration ===

Verify that both settings are included:
  * header_checks (receiving)
  * smtp_header_checks (sending)

<code>
# docker-compose exec mailserver grep header_checks /etc/postfix/main.cf
header_checks = pcre:/etc/postfix/header_checks.pcre
smtp_header_checks = pcre:/etc/postfix/maps/sender_header_filter.pcre
</code>


==== Reload Configuration ====
<code>
# docker-compose up -d --force-recreate
</code>


{{tag>diary postfix Docker}}