On Tue, Aug 15, 2006 at 05:35:26PM +0200, Matthias Hertzog wrote:
> We're facing a growing amount of automatically generated HTTP POST 
> requests, all containing spamvertising links like 

We all do...

> a) Spamfilter of recipient shall filter that

If you are the only recipient and your spamfilter is good... but it doesn't
take the load off the server and the net.

> b) Web-user has to enter a unique number (generated image) in the form to 
> prove, he's a human being.

Quite a problem to keep accessibility for blind users.
 
> c) Badword-Filtering in the formmail-script, some reqular expressions a.s.o.

I prefer bayes filtering for that. My way to do it is available at
https://sourceforge.net/projects/spfgb (public domain). I used it for a
guestbook but the system can be adapted (Quit ugly code yet, but working
quite well!).

Regards
    Peter

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