In order to set up an autoreply for virtual recipients while
still delivering mail as normal, set up a rule in a virtual alias
table:
/etc/postfix/main.cf:
virtual_alias_maps = hash:/etc/postfix/virtual
/etc/postfix/virtual:
user@domain.tld user@domain.tld, user@domain.tld@autoreply.
mydomain.tld
This delivers mail to the recipient, and sends a copy of the
mail to the address that produces automatic replies. The address
can be serviced on a different machine, or it can be serviced
locally by setting up a transport map entry that pipes all mail
for autoreply.
mydomain.tld into some script that sends an automatic
reply back to the sender.
DO NOT list autoreply.
mydomain.tld in
mydestination!
/etc/postfix/main.cf:
transport_maps = hash:/etc/postfix/transport
/etc/postfix/transport:
autoreply.
mydomain.tld autoreply:
/etc/postfix/master.cf:
# =============================================================
# service type private unpriv chroot wakeup maxproc command
# (yes) (yes) (yes) (never) (100)
# =============================================================
autoreply unix - n n - - pipe
flags= user=nobody argv=/path/to/autoreply $sender $mailbox
This invokes /path/to/autoreply with the sender address and
the user@domain.tld recipient address on the command line.
For more information, see the
pipe(8) manual page, and the
comments in the Postfix master.cf file.
