[Spambayes] Filter Based on Recognized Email ISPs - Bounce BackSpam to Sending IP Address

[Tony Meyer]

> I've been out of the technical area for sometime but
> it seems to me that all this spam should be able to be
> bounced back to the sending server.   

FAQ 6.5 covers this (in a very brief way):

<http://spambayes.org/faq.html#why-can-t-i-bounce-spam-back-to-the-sender>

> Couldn't a front end app could be developed that: 
> 
> - Contains a list of all recognized Email providers
> (Yahoo, MSN, NPGCABLE ..) and allow that Email to come through 

You could never collect a list that included every ISP in every country in
the world, let alone all company domains and everyone that has their own
domain.  (Well, maybe you could, but it would include every domain there is,
so would be pointless).

This would also be worthless against almost all spam, which tends to forge
sender addresses.

> - provide option to filters on userid, subject, text. 

Rule-based filtering, like that, is generally less effective than solutions
like SpamBayes (and all the others).

=Tony.Meyer

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