Should have thought before writing :-)
Changed the quries on the backends to
<<
query = SELECT CONCAT('lmtp:[',backend,']:24') AS transport FROM mailbox
WHERE username = '%u@%d' AND active=1 AND backend != '192.168.50.42'
>>
activated dovecot-lmtp on all backends.
That works as it should :-)
tobi
Am 06.11.2014 um 13:57 schrieb Tobi:
> Hello list
>
> I have a postfix setup with a frontend and two backend servers. The
> problem is that one user has forward (ex forwards to his mailbox and to
> another one). The problem is that one mailbox is on backend1 and the
> other (expanded from alias) is on backend2. Now I thought okay I add a
> transport mapn on each backend
>
> <<
> user = xxx
> password = xxx
> hosts = xxx
> dbname = mail
> query = SELECT CONCAT('smtp:[',backend,']:25') AS transport FROM mailbox
> WHERE username = '%u@%d' AND active=1 AND backend != '192.168.50.42'
> now backend1 (ip 192.168.50.42) receives an email for u...@domain.tld
> and this should be expanded to u...@domain.tld and us...@domain.tld.
> u...@domain.tld which mailbox is on backend1 is not the problem and is
> delivered via dovecot.
> But us...@domain.tld which mailbox is on the other backend
> (192.168.50.41) generates the following errors in the logs
>
> <<
> Nov 6 13:39:19 backend2 postfix/smtp[12130]: 5826E280645:
> to=<us...@domain.tld>, orig_to=<u...@domain.tld>,
> relay=192.168.50.41[192.168.50.41]:25, delay=0.07,
> delays=0.05/0.01/0.01/0, dsn=5.4.6, status=bounced (mail for
> [192.168.50.41]:25 loops back to myself)
> I found that this is because domain.tld is listed as
> virtual_mailbox_domains on both backends. So backend1 always assumes
> it's final destination for domain.tld although the transport tells to
> send to another server.
>
> The only way I could see to solve is to perform the alias expension
> already on the smtp frontend. But I could not find a parameter to do
> this like relay_alias_maps or something like that.
> Is there a way to perform the alias on the frontend before it relays to
> the respective backend?
>
> Thanks a lot for any idea :-)
>
> tobi
>
