dovecot - Sep 2008 - rejecting mail due to quota exceeded

Hi,

we are using dovecot's deliver to deliver mails to a virtual mailbox
tree owned by the vmail user, by piping the message to the following
command spawned by vmail:

  /usr/bin/env HOME=/srv/vmail/mydomain.ch/myaccount /usr/lib/dovecot/deliver

When a message is delivered to an account that has reached its
quotum, deliver issues a failure message saying:

  From: Mail Delivery Subsystem <postmaster at seamus.madduck.net>
  To: $ENVELOPE_SENDER
  Message-ID: <dovecot-1221640816-796581-0 at seamus>
  Subject: Automatically rejected mail

  Your message to <vmail> was automatically rejected:
  Quota exceeded

The original message is attached, which is nice, however, I don't
like the dovecot rejection message for two reasons:

1. there was no message to <vmail> sent, dovecot should use the
   envelope recipient

considering that it doesn't know the envelope recipient, this would
best be solved by

2. don't accept the mail and send out a rejection, just exit 69 and
   write the reason to stderr!

Did I miss something and is this already possible with dovecot's
deliver in a virtual setting?

Thanks,

-- 
martin | http://madduck.net/ | http://two.sentenc.es/
 
"how do you feel about women's rights?"
"i like either side of them."
                                                       -- groucho marx
 
spamtraps: madduck.bogus at madduck.net
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On Wed, Sep 17, 2008 at 09:55:16AM +0100, martin f krafft
wrote:
> When a message is delivered to an account that has reached its
> quotum, deliver issues a failure message saying:
> 
> [...] 
> 
> considering that it doesn't know the envelope recipient, this would
> best be solved by
> 
> 2. don't accept the mail and send out a rejection, just exit 69 and
>    write the reason to stderr!
> 
> Did I miss something and is this already possible with dovecot's
> deliver in a virtual setting?
To exit with EX_TEMPFAIL instead of sending a rejection message, use
deliver's -e flag and the following dovecot.conf snippet, taken straight
from our mail server.

protocol lda {

  # If user is over quota, return with temporary failure instead of
  # bouncing the mail.
  quota_full_tempfail = yes
  quota_exceeded_message = 4.2.2 Mailbox full

}

We only changed quota_exceeded_message because of Postfix' support of
enhanced status codes, which gets you a nice bounce message with the right
diagnostic code.

This requires dovecot 1.0.1 or later, according to
http://wiki.dovecot.org/LDA; additionally writing the rejection reason to
stderr requires dovecot 1.1.1 or later.