[Mimedefang] Block mail by subject

[Paul Murphy]

> By the way anyone reading this, can you tell me how I mite modify this
> chunk of code to block subjects where one word is rejectable e.g.
> 
> Buy your Viagra
> Get your Viagra
> Viagra cheap
> 
> Different subjects with a common word
> 
> \ [*] Viagra [*] / or something like that

You could start with $subject =~ /Viagra/i; which will catch all subjects which
contain the word, in a case-insensitive way.  However, 99% of Viagra ads now
coming through have some form of obfuscation, including but not limited to:

Vi at gra
V|agra
Viägra
V.I.A.G.R.A.
Vi agra

And so on.

Use Spamassassin, auto whitelisting, greylisting, Vipul's Razor, DCC, and
bayesian filtering and you'll kill 99.9% of them.  Filter only by subject and
you'll get less than 2% if you're lucky.  Then try the same with Cialis and all
of the other interesting strings, and see if your filter can do all of its
checks before Sendmail times it out...

Best Wishes,

Paul.
__________________________________________________
Paul Murphy
Head of Informatics
Ionix Pharmaceuticals Ltd
418 Science Park, Cambridge, CB4 0PA

Tel. 01223 433741
Fax. 01223 433788


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