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feat(postfix): prefer IPv4 in SMTP client

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link2xt
2026-03-21 21:24:57 +00:00
committed by l
parent e687120d96
commit d3a483c403
1 changed files with 16 additions and 0 deletions
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16
cmdeploy/src/cmdeploy/postfix/main.cf.j2
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@@ -88,6 +88,22 @@ inet_protocols = ipv4
inet_protocols = all
{% endif %}
# Postfix does not try IPv4 and IPv6 connections
# concurrently as of version 3.7.11.
#
# When relay has both A (IPv4) and AAAA (IPv6) records,
# but broken IPv6 connectivity,
# every second message is delayed by the connection timeout
# <https://www.postfix.org/postconf.5.html#smtp_connect_timeout>
# which defaults to 30 seconds. Reducing timeouts is not a solution
# as this will result in a failure to connect to slow servers.
#
# As a workaround we always prefer IPv4 when it is available.
#
# The setting is documented at
# <https://www.postfix.org/postconf.5.html#smtp_address_preference>
smtp_address_preference=ipv4
virtual_transport = lmtp:unix:private/dovecot-lmtp
virtual_mailbox_domains = {{ config.mail_domain }}
lmtp_header_checks = regexp:/etc/postfix/lmtp_header_cleanup