Actually, LMTP inet listener is only used for delivery purpose.
I separated the MTA and the MDA on distinct hosts.
Incomming mails are received by the MTA which proceed to some check (anti-virus, spams, and aliases) and transport them to the MDA with LMTP.

Maybe I misunderstood something, but i don't see why LMTP is involve in a sieve forwarding process (or stuff like non delivery mail return) .
According to comments in the "15-lda.conf" file :

   # Binary to use for sending mails.
   #sendmail_path = /usr/sbin/sendmail

   # If non-empty, send mails via this SMTP host[:port] instead of
   sendmail.
   submission_host = smtp.mydomain.tld

If you don't use the 'submission_host' option, dovecot will forward mail with '/usr/sbin/sendmail' binary which use the forwarders you tell it to use, am i right ?

Regards,

Raphael

Le 26/10/2012 11:00, Thomas Leuxner a écrit :
On Fri, Oct 26, 2012 at 10:51:52AM +0200, Raphael Ordinas wrote:

    service lmtp {
       inet_listener lmtp {
         address = 172.0.0.1
         port = 2525
       }
    }
Right, so you are using network sockets with LMTP. Probably does not
answer the question why it is not working with the 'submission_host',
but is there a reason why the redirects are not reinjected this way?

    submission_host = smtp.mydomain.tld
Regards
Thomas

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