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Blocking (random) numerical addresses

  Ahh, spam with random numbers in the username and domain parts.

25698r   MAIL From:<25315805@15021.com>
25698w   250 2.1.0 Sender syntax Ok

  How about a facility to block using regular expressions, with the
Perl-style extensions? \d+@\d+\..* would be nice to block... The dns
lookup based filtering scares me a bit (dns outages aren't that rare).

  It would be nice if one could filter in the router too. For example, the
X-Advertisement header with an IEMMC URL is a good sign of a spam.

 < Heikki Hannikainen      <> ax.25:   oh7lzb@oh7rba.fin.eu   >
 < Internet: hessu@pspt.fi <> Amprnet: oh7lzb@oh7rba.ampr.org >

---------- Forwarded message ----------
Received: from retriever.itps.co.uk ([] HELO retriever.itps.co.uk ident: NO-IDENT-SERVICE [port 59402]) by zone.pspt.fi with SMTP id <182356-20573>; Tue, 19 Aug 1997 04:12:36 +0300
From:	25315805@15021.com
Received: from retriever.itps.co.uk by retriever.itps.co.uk (8.6.9) id WAA21134; Mon, 18 Aug 1997 22:10:48 +0100
Received: from mailhost.tbill.com(alt1.tbill.com( by tbill.com (8.8.5/8.6.5) with SMTP id GAA03213 for <PBest@TBill.com>; Mon, 18 Aug 1997 13:34:00 -0600 (EST)
Date:	Mon, 18 Aug 97 13:34:00 EST
To:	PBest@TBill.com
Subject: Your Web Page
Message-ID: <319702170025.GAA08056@tbill.com>
Reply-To: PBest@TBill.com
X-UIDL: 4631431056a78aeb1b128fda426c9a5e
Comments: Authenticated sender is <PBest@TBill.com>
Return-Path: <25315805@15021.com>
X-Orcpt: rfc822;oh7lzb@zone.pspt.fi

Now you can submit your Web Page to over 620 Internet indexes in a few 
short minutes ....

  [central-registry rubbish deleted]