dovecot - Jul 2013 - Postfix aliases with quota-status service

The latest HG commits seem to have fixed some underlying problems with the
'quota-status' service. Now doing some quick tests I wonder if this can
be used with aliases on the Postfix side. Appears the
'check_policy_service' used in the example below will query existing
users via Dovecot's Auth Backend:

http://sys4.de/en/blog/2013/04/05/dovecot-quota-mit-postfix-abfragen/
http://www.postfix.org/SMTPD_POLICY_README.html

This works fine for Dovecot user 'philo' where the mail is rejected
upfront before it enters the queue:

==> /var/log/mail.log <=Jul 30 13:41:18 spectre postfix/smtpd[31072]:
NOQUEUE: reject: RCPT from host.example.com[1.2.3.4]: 554 5.2.2 <philo at
trashheap.net>: Recipient address rejected: Quota exceeded (mailbox for use
r is full); from=<user at example.com> to=<philo at trashheap.net>
proto=ESMTP helo=<host.example.com>

Now user 'gunge' is an alias for 'philo' in Postfix, thus the
quota check will not recognize the user, will queue the message and reject it at
the MDA stage:

==> /var/log/mail.log <=Jul 30 14:41:02 spectre postfix/lmtp[31460]:
3c4HSD5ZkBzBP: to=<philo at trashheap.net>, orig_to=<gunge at
trashheap.net>, relay=spectre.leuxner.net[private/dovecot-lmtp], delay=1.2,
delays=1.1/0.01/0/0.13, dsn=4.2.2, status=deferred (host
spectre.leuxner.net[private/dovecot-lmtp] said: 452 4.2.2 <philo at
trashheap.net> Quota exceeded (mailbox for user is full) (in reply to end of
DATA command))

This is probably intended behaviour, just want to make sure that I'm not
missing a point here. For now the only fix that comes to my mind to create
"quota aware" aliases - is creating 'dummy' users in Dovecot
which point to the same mailbox rather than performing aliasing on the Postfix
end. Open to suggestions...

Regards
Thomas
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On Tue, Jul 30, 2013 at 03:20:47PM +0200, Thomas Leuxner
wrote:
> This is probably intended behaviour, just want to make sure that I'm
not
> missing a point here. For now the only fix that comes to my mind to create
> "quota aware" aliases - is creating 'dummy' users in
Dovecot which point to
> the same mailbox rather than performing aliasing on the Postfix end. Open
> to suggestions...
It depends on your user and/or alias database (i.e. how and where they're
stored).

I use LDAP, and configured Dovecot's userdb lookup to handle both
"main"
and "alias" addresses, like so:

user_filter = (|(mail=%u)(mailAlternateAddress=%u))

(As far as Dovecot is concerned, there's actually no difference between
"main" and "alias".)

If you store your mailbox and alias information in the same data source
(LDAP, SQL, ...), you should be able to do the same.