From: Anton Herber (anton.herberincom.de)
Date: Fri Feb 29 2008 - 02:45:00 CST

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Since some days I'm receiving mails which cause "mail forwaring loops".

Feb 28 11:13:01 host postfix/qmgr[16553]: 88D0011E3D79:
from=<unknown_userhost.example>, size=2626, nrcpt=1 (queue active)
Feb 28 11:13:01 host postfix/local[16946]: 88D0011E3D79:
to=<known_userhost.example>, relay=local, delay=0.03,
delays=0.01/0/0/0.02, dsn=5.4.6, status=bo
unced (mail forwarding loop for known_userhost.example)
Feb 28 11:13:01 host postfix/cleanup[17080]: 8FAF211E3F6E:
message-id=<20080228101301.8FAF211E3F6Ehost.example>
Feb 28 11:13:01 host postfix/bounce[17198]: 88D0011E3D79: sender
non-delivery notification: 8FAF211E3F6E
Feb 28 11:13:01 host postfix/qmgr[16553]: 8FAF211E3F6E: from=<>,
size=4532, nrcpt=1 (queue active)
Feb 28 11:13:01 host postfix/qmgr[16553]: 88D0011E3D79: removed
Feb 28 11:13:01 host postfix/local[17134]: 8FAF211E3F6E:
to=<unknown_userhost.example>, relay=local, delay=0.01, delays=0/0/0/0,
dsn=5.1.1, status=bounced
(unknown user: "unknown_user")

It's obviously spam. What can i do about it? I found a posting advising
to filter out mails with "/^(Delivered-To: ...". Is it the only solution
to this problem? Because the mail from tag used is always random I'm
sending non delivery notifications to non existent users which are bounced.

How can I filter those mails?

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