> From: [EMAIL PROTECTED]> To: [email protected]> Date: Mon, 24 Sep 2007
> 13:58:29 +0200> Subject: [Dbmail] Spammer and dbmail> > I've got such a
> SPAM:> > Received: from ip101.dyn1.gkk.schedom-europe.net (unknown >
> [83.101.13.101])> by protegate5.zmi.at (Postfix) with ESMTP id 37ED547D> for
> <[EMAIL PROTECTED]>; Sun, 23 Sep 2007 15:59:13 +0200 (CEST)> Received: from
> [83.101.13.101] by mailgate2.brunel.ac.uk; , 23 Sep 2007> 15:00:25 +0100>
> Message-ID: <[EMAIL PROTECTED]>> From: "Michel Nadeau"> To: <[EMAIL
> PROTECTED]>> Subject: RE: Thanks for taking our survey> > As you can see, the
> "From" address does not contain any e-mail address > nor domain, but the
> users sees this then:> From: Michel [EMAIL PROTECTED] ()> > "zmi.at" is the
> domain our server is running at, so I'm not sure it's > not the fault of the
> e-mail program of our customer, or our server. > Does anyone know how to
> prevent such an expansion? As this is only the > message "From:" line, our
> spam filters don't care about the content, > the envelope "From" is checked.>
> > mfg zmi> -- > // Michael Monnerie, Ing.BSc ----- http://it-management.at>
> // Tel: 0676/846 914 666 .network.your.ideas.> // PGP Key: "curl -s
> http://zmi.at/zmi.asc | gpg --import"> // Fingerprint: EA39 8918 EDFF 0A68
> ACFB 11B7 BA2D 060F 1C6F E6B0> // Keyserver: www.keyserver.net Key-ID:
> 1C6FE6B0
See pls http://www.gabacho-net.jp/en/anti-spam/anti-spam-system.html
The only method I know is a
1. protocol delay 20-35 s before obtaining mail (resources required) or
2. complitely reject mail
from host names like "ip101.dyn1.gkk.schedom-europe.net (unknown
[83.101.13.101])", if not AUTH.
Require SMTP AUTH from Your real clients.
I think, all *real* MX host *must* have reverse DNS name. Some hosts, where
reverse FQDN corresponds to multiple IP addresses, may be whitelisted manualy.
Direct mail from private adsl, ppp, etc... hosts to many different MX is a
preffered SPAM method now. Blacklists is not effect in this case. Best regards
Vladimir
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