Public bug reported:
This occurs because /etc/resolv.conf gets copied to
/var/spool/postfix/resolv.conf before the network is up and therefore
before it contains any useful data. Therefore, every message fails to
be sent or received with a message such as "dsn=4.4.3, status=deferred
(Host or domain name not found. Name service error for name=example.com
type=MX: Host not found, try again)". If Postfix is restarted or if the
file is manually copied into the chroot again, Postfix resumes normal
operation.
** Affects: postfix (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1627117
Title:
After systemd integration enabled, Postfix will no longer send mail on
startup
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