On Fri, 23 Apr 2010, Always Learning wrote:

> From: Always Learning <[email protected]>
> To: Exim Users <[email protected]>
> Date: Fri, 23 Apr 2010 17:21:40
> Subject: Re: [exim] Exim Mailing List - Imposing Mimimum Technical Posting
>     Standards ?

...

> The test in Exim is
> 
> deny    message       = [C06.5]  Msg6 Msg2
>         hosts         = ^.*[a].?[d].?[s].?[l]*
> 
> and is intended to reject mail from mail servers having 'adsl' in
> the host name of their connection. 'olga.hinterlands.org' clearly
> does not have 'adsl' but does have 'ads' so I am changing the test
> to
> 
>         hosts         = ^.*[a].?[d].?[s].?[l].?

An alternative to this is to use John Rudd's botnet spamassassin
plugin:

http://people.ucsc.edu/~jrudd/spamassassin/

and assign an appropriate score to suspect DNS hosts.
-- 
Dennis Davis, BUCS, University of Bath, Bath, BA2 7AY, UK
[email protected]               Phone: +44 1225 386101

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