sieve vacation alias handling problem

[Karol Augustin]

Hi,

I am using Dovecot LDA as LMTP renders envelope extension unusable.

The problem I have noticed is that when user has multiple aliases sieve
responds to all of them, not only to :addresses specified.

>From testing it seems that :addresses only adds addresses to the list of
"known" emails to check against. It is not limiting it.

As I understand, sieve should check if To: header is consistent with
addresses known to be users. But how Dovecot knows about aliases
assigned to the user?

>From my testing if header To: address is consistent with envelope To:
address the reply is fired. I have sieve_vacation_use_original_recipient
left at it's default value (no), so that shouldn't be the case. Now if
user address at example.com has alias alias at example.com specified, the
vacation reply will be sent to email addressed to alias at example.com,
which is weird, because this behavior should be enabled by switching
sieve_vacation_use_original_recipient to yes.

When user receives an email that was originally sent to his gmail
account (forwarded) there is no reply. If I add gmail address to
:addresses reply is generated as expected.

So my main question is if this is expected? I would like to enable only
delivery to primary address and to + extensions to that address by
default.

I think that it might be that Postfix is expanding aliases and passing
the final recipient (as to=<XXX>) to dovecot. Then dovecot is using that
address to check for explicit delivery, but something fails, as this
address is obviously not in To: header. So it looks like orig_to has to
be used as well which should be disabled by
sieve_vacation_use_original_recipient?


My address is: karol at augustin.pl, alias is: carol at augustin.pl


Mar  2 12:37:32 mail dovecot: lda(karol at augustin.pl): sieve:
msgid=<3ba0578a5f6b170e942b5bac1b19be36 at posteo.net>: sent vacation
response to <sender at example.com>
Mar  2 12:37:32 mail postfix/qmgr[4744]: 3zt82h4CG4z2xlw: from=<>,
size=732, nrcpt=1 (queue active)
Mar  2 12:37:32 mail dovecot: lda(karol at augustin.pl): sieve:
msgid=<3ba0578a5f6b170e942b5bac1b19be36 at posteo.net>: stored mail into
mailbox 'INBOX'
Mar  2 12:37:32 mail postfix/pipe[8793]: 3zt82f3x4xz2xmw:
to=<karol at augustin.pl>, orig_to=<carol at augustin.pl>, relay=dovecot,
delay=2.2, delays=2.2/0/0/0.06, dsn=2.0.0, status=sent (delivered via
dovecot service)


Forward from from gmail:

Mar  2 11:38:19 mail postfix/qmgr[4744]: 3zt6kL1yF7z2xgg:
from=<karolaug+caf_=karol=augustin.pl at gmail.com>, size=5831, nrcpt=1
(queue active)
Mar  2 11:38:19 mail dovecot: lda(karol at augustin.pl): sieve:
msgid=<e610a47934f9aabb31f833c025075cff at posteo.net>: discarding vacation
response for implicitly delivered message; no known (envelope) recipient
address found in message headers (recipient=<karol at augustin.pl>, and
additional `:addresses' are specified)
Mar  2 11:38:19 mail dovecot: lda(karol at augustin.pl): sieve:
msgid=<e610a47934f9aabb31f833c025075cff at posteo.net>: stored mail into
mailbox 'INBOX'
Mar  2 11:38:19 mail postfix/pipe[5362]: 3zt6kL1yF7z2xgg:
to=<karol at augustin.pl>, relay=dovecot, delay=1.3, delays=1.2/0/0/0.05,
dsn=2.0.0, status=sent (delivered via dovecot service)


from my master.cf:
dovecot unix - n n - - pipe
   flags=DRhu user=vmail:vmail argv=/usr/lib/dovecot/dovecot-lda -f
${sender} -a ${original_recipient} -d ${user}@${nexthop}



Thanks,
Karol

-- 
Karol Augustin
karol at augustin.pl
http://karolaugustin.pl/
+353 85 775 5312