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feat(postfix): disable processing of MIME headers

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Default behavior is processing headers
that are actually part of the message body.
This is unlikely to be needed
as headers such as Received are not added into MIME parts,
but may result in broken DKIM signatures
if the body is modified.
This commit is contained in:
link2xt
2026-06-29 16:06:44 +00:00
committed by l
parent 0323e757a9
commit deca1ef2a3
1 changed files with 8 additions and 0 deletions
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cmdeploy/src/cmdeploy/postfix/main.cf.j2
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@@ -85,6 +85,14 @@ inet_protocols = all
lmtp_header_checks = regexp:/etc/postfix/lmtp_header_cleanup
# Do not apply header checks to MIME headers
# and other headers that are actually part of the message body.
# Reference:
# <https://www.postfix.org/postconf.5.html#disable_mime_input_processing>
# <https://www.postfix.org/header_checks.5.html>
# <https://stump.io/blog/2020/11/29/a-little-gotcha-with-postfixs-header_checks/>
disable_mime_input_processing = yes
mua_client_restrictions = permit_sasl_authenticated, reject
mua_sender_restrictions = reject_sender_login_mismatch, permit_sasl_authenticated, reject
mua_helo_restrictions = permit_mynetworks, reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, permit