On 10 Jan 2020, at 12:28, Gerben Wierda wrote:
postfix is started during boot on my macOS system. This fails with:
Jan 10 18:00:08 mail postfix/master[488]: fatal: bind 0.0.0.0 port 25:
Address already in use
Jan 10 18:00:10 mail /postfix-script[511]: fatal: mail system startup
failed
but when I shortly thereafter launch it it just starts fine.
Apple includes its own customized version of Postfix in macOS, with a
launchd config which runs 'master -e 60' at boot and whenever
/var/spool/postfix/maildrop/ changes (i.e. mail is sent using
/usr/sbin/sendmail.) Unfortunately, the default config
(/etc/postfix/master.cf) enables postscreen, smtpd, and submission,
which means ports 25 and 587 have listeners bound for 60 seconds at
boot.
Assuming you're running Postfix in a different prefix (ew.g. MacPort's
/opt/local/) It should be safe to modify /etc/postfix/master.cf to
disable postscreen, smtpd, and submission OR modify
/System/Library/LaunchDaemons/com.apple.postfix.master.plist to reduce
the runtime to something just long enough to clear a single-message
queue under boot-time load, e.g. 2-5 seconds.
It is also possible in older MacOS X versions (i.e. those for which
Apple no longer releases updates) to disable their Postfix entirely and
replace it with your custom one by symlinking /etc/postfix/,
/var/spool/postfix/ and /usr/sbin/sendmail to your custom build's
equivalents.
--
Bill Cole
[email protected] or [email protected]
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not For Hire (currently)
