Hi all,
running several postfix instances, it should be possible to let them
communicate over unix sockets as they are all on the same machine. There
are three instances that accept mails (local, submission, and internet)
and forward them to the fourth instance that deals with delivery. That
fourth instance should listen on a unix socket, the three other
instances should have a corresponding transport.
For the delivering instance, postfix-out, i added in the master.cf:
smtpd unix n - y - - smtpd
After restarting the instance, /var/spool/postfix-out/public/smtpd
exists with owner postfix:postfix and mod 4666.
For testing purposes (i do not want have trouble with incoming and
submission mails) i only changed the local, null-client, instance
postfix in main.cf:
default_transport = lmtp:unix:/var/spool/postfix-out/public/smtpd
Sending a mail by
root@bywater /etc/postfix # sendmail -i -f root -t <<EOF
From: root
To: [email protected]
Subject: test
test
EOF
Shows in mail.info for instance postfix:
2025-10-19T14:27:02.660689+02:00 bywater postfix/pickup[2064535]:
A13661E12A4: uid=0 from=<root>
2025-10-19T14:27:02.665159+02:00 bywater postfix/cleanup[2064540]:
A13661E12A4: message-id=<[email protected]>
2025-10-19T14:27:02.714870+02:00 bywater postfix/qmgr[2064536]:
A13661E12A4: from=<[email protected]>, size=291, nrcpt=1 (queue active)
2025-10-19T14:27:02.773551+02:00 bywater postfix/lmtp[2064542]:
A13661E12A4: to=<[email protected]>, relay=none, delay=0.12,
delays=0.11/0.01/0/0, dsn=4.4.1, status=deferred (connect to
bywater.qno.de[/var/spool/postfix-out/public/smtpd]: No such file or
directory)
No log entries for instance postfix-out.
man 8 lmtp says:
unix:pathname
Connect to the local UNIX-domain server that is bound to the
specified pathname. If the process runs chrooted, an absolute pathname
is interpreted relative to the Postfix queue directory.
As postfix and postfix-out are in different chroot, it is not possible
to create a path from one chroot to the other, so i made a symbolic link:
root@bywater /var/spool/postfix/public # ln -s
/var/spool/postfix-out/public/smtpd
and changed in main.cf:
default_transport = lmtp:unix:public/smtpd
Still no such file or directory.
But there must be a way to transport mail via unix socket from one
postfix instance to another?
TIA
QNo
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