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List:       postfix-users
Subject:    Re: status=bounced (user unknown)
From:       Ansgar Wiechers <lists () planetcobalt ! net>
Date:       2012-08-28 17:51:51
Message-ID: 20120828175151.GC20404 () mail ! planetcobalt ! net
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On 2012-08-28 Thufir wrote:
> relay_domains = lists.dur.bounceme.net

You configured list.dur.bounceme.net as the domain for your mailing
lists, but ...

> Aug 28 04:28:36 dur postfix/smtp[5985]: E0507184319:
> to=<beta@dur.bounceme.net>, relay=none, delay=58,
> delays=58/0.02/0.06/0, dsn=4.4.1, status=deferred (connect to
> dur.bounceme.net[70.71.113.158]:25: Connection refused)

... then you use dur.bounceme.net (without the "lists" subdomain) as the
recipient domain, i.e. you're not sending anything to a list address in
the first place. Also, you don't seem to have a host that is the final
destination for dur.bounceme.net (dur.bounceme.net is $myhostname, but
not listed in $mydestination).

What happens is most likely this:

1. You submit a message to <beta@dur.bounceme.net> from 127.0.0.1.

2. 127.0.0.1 is listed in $mynetworks and thus allowed to relay by the
   permit_mynetworks restriction in $smtpd_recipient_restrictions.

3. $relay_transport is set to "relay" (which is the default anyway), and
   neither $relay_transport, nor $sender_dependent_relayhost_maps, nor
   $relayhost are set, so the recipient domain (dur.bounceme.net)
   becomes the nexthop destination (see the relay_transport entry in
   "man 5 postconf").

4. Postfix on dur.bounceme.net is not listening on the external
   interface ($inet_interfaces = loopback-only), so the connection to
   70.71.113.158:25 fails.

If you want your server to accept mail for dur.bounceme.net, you must
either make it the final destination for that domain, or you have to
make the server accept mail to that domain for relaying.

Regards
Ansgar Wiechers
-- 
"Abstractions save us time working, but they don't save us time learning."
--Joel Spolsky
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