Once upon a time, Wietse Venema <wie...@porcupine.org> said:
> Maybe PLESK has an option to make "mailbox full" a hard error (to be
> honest, Postfix's own "mailbox full" action is not configurable).

Unfortunately, no, it isn't.  Plesk uses a milter to check delivery
status during SMTP (which is nice, since that way it doesn't queue and
cause back-scatter), but only returns a temporary error for over quota.
Worse, it doesn't check until the end of DATA, so if any one recipient
is over quota, the message is rejected (so you really don't want to turn
a Plesk over-quota message into a permanent error, at least for messages
with multiple recipients).

I wrote a milter for our Plesk servers to check quota at RCPT TO time
instead (and return a permanent error for over-quota) to fix the bad
behavior.

-- 
Chris Adams <cmad...@hiwaay.net>
Systems and Network Administrator - HiWAAY Internet Services
I don't speak for anybody but myself - that's enough trouble.

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