On Sat, 19 Jan 2013 20:22:53 +0100
Reindl Harald <h.rei...@thelounge.net> wrote:

> * please do not strip most informations from log, one stripped line
> is not enough
> * which machine throws the warning

That would be clever, wouldn't it? =D

Here's a single transaction from bast, using account 'null', which I
use for test purposes and such:

Jan 19 12:58:05 bast postfix/smtpd[19019]: warning: 206.225.172.6:
address not listed for hostname bast.chez-vrolet.net Jan 19 12:58:05
bast postfix/smtpd[19019]: connect from unknown[206.225.172.6] Jan 19
12:58:05 bast postfix/smtpd[19019]: 7804ED4051: client=unknown
[206.225.172.6] Jan 19 12:58:05 bast postfix/cleanup[19023]:
7804ED4051:
message-id=<20130119125654.88f18c3d0aed5d6300fa8...@chez-vrolet.net>
Jan 19 12:58:05 bast postfix/smtpd[19019]: disconnect from unknown
[206.225.172.6] Jan 19 12:58:05 bast postfix/qmgr[1497]: 7804ED4051:
from=<dennistheti...@chez-vrolet.net>, size=705, nrcpt=1 (queue active)
Jan 19 12:58:05 bast postfix/local[19024]: 7804ED4051:
to=<n...@chez-vrolet.net>, relay=local, delay=0.17, delays=0.16/0/0/0,
dsn=2.0.0, status=sent (delivered to file: /dev/null) Jan 19 12:58:05
bast postfix/qmgr[1497]: 7804ED4051: removed

...and from my workstation, shere-khan:

Jan 19 12:58:05 shere-khan postfix/pickup[8509]: 4951F8C3C5: uid=1000
from=<dennisthetiger> Jan 19 12:58:05 shere-khan postfix/cleanup[8774]:
4951F8C3C5:
message-id=<20130119125654.88f18c3d0aed5d6300fa8...@chez-vrolet.net>
Jan 19 12:58:05 shere-khan postfix/qmgr[7293]: 4951F8C3C5:
from=<dennistheti...@chez-vrolet.net>, size=518, nrcpt=1 (queue active)
Jan 19 12:58:05 shere-khan postfix/smtp[8777]: 4951F8C3C5:
to=<n...@chez-vrolet.net>, relay=127.0.0.1[127.0.0.1]:2525, delay=0.29,
delays=0.02/0.01/0.08/0.17, dsn=2.0.0, status=sent (250 2.0.0 Ok:
queued as 7804ED4051) Jan 19 12:58:05 shere-khan postfix/qmgr[7293]:
4951F8C3C5: removed

...by comparison, here's one if I send from my gmail acount, and here,
you'll note the lack of such a warning:

Jan 19 13:00:14 bast postfix/smtpd[19043]: connect from
mail-ie0-f170.google.com[209.85.223.170] Jan 19 13:00:14 bast
postfix/smtpd[19043]: A81F5D4051: client=mail-ie0-f170.google.com
[209.85.223.170] Jan 19 13:00:14 bast postfix/cleanup[19048]:
A81F5D4051: message-id=<CAFgCO2Zm1B6Pc_6YS9J=LK=_MjXrC
+bbFxyx=xmdhc0xwpw...@mail.gmail.com> Jan 19 13:00:14 bast postfix/qmgr
[1497]: A81F5D4051: from=<dennistheti...@gmail.com>, size=1784, nrcpt=1
(queue active) Jan 19 13:00:14 bast postfix/smtpd[19043]: disconnect
from mail-ie0-f170.google.com[209.85.223.170] Jan 19 13:00:14 bast
postfix/local[19049]: A81F5D4051: to=<dennistheti...@chez-vrolet.net>,
relay=local, delay=0.37, delays=0.31/0.01/0/0.05, dsn=2.0.0,
status=sent (delivered to mailbox) Jan 19 13:00:14 bast postfix/qmgr
[1497]: A81F5D4051: removed


> * connection comes from where?

The connection is an ssh tunnel from my workstation.  My workstation
has localhost port 2525 tunnelled to bast port 25.

> * what says the host-command on the machine which throws the warning?

root@bast:/etc/postfix# host bast.chez-vrolet.net
bast.chez-vrolet.net has address 206.225.172.6

Comparative: 

dennisthetiger@shere-khan:~$ host bast.chez-vrolet.net
bast.chez-vrolet.net has address 206.225.172.6

-Dennis

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