Jan Johansson:
> Ok, I am seeing a lot of mail on one of our machines. They are all
> headed for a few servers running PLESK.
>
> It appears that (from google'ing) that this software generates a
> 451 error when a recipients mailbox is full It is possible to have
> postfix kill of these messages and treat a 451 from certain servers
> as a permanent error?
Maybe PLESK has an option to make "mailbox full" a hard error (to be
honest, Postfix's own "mailbox full" action is not configurable).
Otherwise you can try to use the smtp_reply_filter feature. This
is an incedibly sharp knife for desperate situations. Use at your
own risk.
Untested example:
/etc/postfix/main.cf:
smtp_reply_filter = /etc/postfix/smtp_reply_filter.pcre
/etc/postfix/smtp_reply_filter.pcre:
# This assumes that the reply is one line only.
/^451 PLESK reply text here/ 551 5.2.2 Mailbox full
Make the PCRE pattern as specific as possible, so that it matches
only PLESK responses.
Another option is to configure a specific SMTP client in master.cf
for PLESK deliveries, put the smtp_reply_filter option in master.cf,
and direct mail to this client with the transport_maps feature.
References:
RFC 3653 Section 3.3
http://www.postfix.org/postconf.5.html#smtp_reply_filter
For the second option:
http://www.postfix.org/master.5.html
http://www.postfix.org/transport.5.html
Wietse
