I'm receiving lots of spam messages with headers like the following:
Delivered-To: [EMAIL PROTECTED]
From: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
where the "random" in [EMAIL PROTECTED] is, as you guessed, a random string.
I don't know why the spammer chose to add a Delivered-To: header; maybe it
is meant to confuse some mail servers and/or spam filters and make them
deliver the message. Anyway, the point is that Courier accepts the message,
then courierlocal rejects it with:
Mail loop - already have my Delivered-To: header.
and generates a DSN to [EMAIL PROTECTED], which is an invalid user and is
immediately rejected with:
550 User unknown.
This in turn generates a DSN to postmaster, which goes to my inbox.
Attached is an excerpt from the log file showing the handling of one such
message.
If I enable backscatter suppression from senders with relaying privileges,
will this go away? If that's not the case, what can I do about it?
I wonder if Courier could reject messages like this during the SMTP
transaction and avoid generating the DSN in the first place, but I guess
that if it doesn't do so already there's some technical reason.
--
Flavio Stanchina
Informatica e Servizi
Trento - Italy
Jan 8 10:07:20 mail courierd: newmsg,id=00048891.45A209C6.00003BBF: dns;
LPuteaux-151-41-26-82.w217-128.abo.wanadoo.fr ([::ffff:217.128.46.82])
Jan 8 10:07:20 mail courierd:
started,id=00048891.45A209C6.00003BBF,from=<[EMAIL
PROTECTED]>,module=local,[EMAIL
PROTECTED]/home/courier/ies.it/ltsupport!!,addr=<[EMAIL PROTECTED]>
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=4, inprogress=1
Jan 8 10:07:20 mail courierlocal: id=00048891.45A209C6.00003BBF,from=<[EMAIL
PROTECTED]>,addr=<[EMAIL PROTECTED]>: Mail loop - already have my Delivered-To:
header.
Jan 8 10:07:20 mail courierlocal: id=00048891.45A209C6.00003BBF,from=<[EMAIL
PROTECTED]>,addr=<[EMAIL PROTECTED]>,status: failure
Jan 8 10:07:20 mail courierd: completed,id=00048891.45A209C6.00003BBF
Jan 8 10:07:20 mail courierd:
started,id=00048891.45A209C6.00003BBF,from=<>,module=dsn,host=,addr=<[EMAIL
PROTECTED]>
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=4, inprogress=1
Jan 8 10:07:20 mail courierd: newmsg,id=00048892.45A209C8.00003BC9: dns;
localhost (localhost [127.0.0.1])
Jan 8 10:07:20 mail courierd:
id=00048892.45A209C8.00003BC9,from=<>,addr=<[EMAIL PROTECTED]>: 550 User
unknown.
Jan 8 10:07:20 mail courierd:
id=00048892.45A209C8.00003BC9,from=<>,addr=<[EMAIL PROTECTED]>,status: failure
Jan 8 10:07:20 mail courierd: completed,id=00048892.45A209C8.00003BC9
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=5, inprogress=1
Jan 8 10:07:20 mail courierd:
started,id=00048892.45A209C8.00003BC9,from=<>,module=dsn,host=,addr=<postmaster>
Jan 8 10:07:20 mail courierd: completed,id=00048891.45A209C6.00003BBF
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=4, inprogress=1
Jan 8 10:07:20 mail courierd: newmsg,id=00048895.45A209C8.00003BCB: dns;
localhost (localhost [127.0.0.1])
Jan 8 10:07:20 mail courierd:
started,id=00048895.45A209C8.00003BCB,from=<[EMAIL
PROTECTED]>,module=local,host=flavio!!1000!1000!/home/flavio!!,addr=<flavio>
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=5, inprogress=2
Jan 8 10:07:20 mail courierd: completed,id=00048892.45A209C8.00003BC9
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=none, wakeup time=Mon
Jan 8 10:11:13 2007, queuedelivering=4, inprogress=1
Jan 8 10:07:20 mail courierlocal: id=00048895.45A209C8.00003BCB,from=<[EMAIL
PROTECTED]>,addr=<[EMAIL PROTECTED]>,size=6249,success: Message delivered.
Jan 8 10:07:20 mail courierd: completed,id=00048895.45A209C8.00003BCB
Jan 8 10:07:20 mail courierd: Waiting. shutdown time=Mon Jan 8 10:12:20
2007, wakeup time=Mon Jan 8 10:11:13 2007, queuedelivering=3, inprogress=0
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