Great Circle Associates Firewalls
(June 1995)
 

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Subject: Mail filter (was: re: UNSCRIBE)
From: peter @ i3 . informatik . rwth-aachen . de (Peter Heimann)
Date: Fri, 9 Jun 95 16:13:14 +0200
To: firewalls @ greatcircle . com

Padgett Peterson writes:
> I find it humorous that the mailserver on a system dedicated to computer
> security and determining whether packets/applications are safe to allow
> is unable to provide a filter to reject/return any message containing
> only one or two alpha strings on the first line and in which the first
> three characters are "uns" and which is also followed somewhere in the 
> string by a "b" (all case insensitive).

The "resend" perl script in Brent Chapman's mailing list manager software 
Majordomo can already do that. If administrivia checks for a list are
enabled, mails that match certain regular expressions in the Subject: header 
or the first 5 lines of the body are rejected and sent to the moderator for
approval. It might be necessary to enhance the default
  /\bunsubscribe\b/i || /^unsub\b/i
with 
  /\bunscribe\b/i
to catch the current clueless mails as well.

Such a filter can however generate false positives, which means additional
work for the moderator who has to approve such messages.

--
Peter Heimann

Lehrstuhl fuer Informatik III        peter @
 i3 .
 informatik .
 rwth-aachen .
 de
RWTH Aachen


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