> This  really  is highly fragile answer. The VERP RFC, for one example,
> 
> ...
> 
> I  would  just  warn  everyone  to be aware of the likelihood 
> of false positives,  especially  from  well-behaved, even 
> distinctly anti-spam, sources.


Hi Sandy

Yes you're right: There can be legitime messages containing more then 3
digits in the from adress.
But I'm sure you know that no spam-test is a 100% indicator of spam. 

We've implemented every single test based on a detailed statistical
research on our server. We've seen that this two test are very good
indicators of spam. Less then 2% of positive SenderwithCode-tests are
false positives (4% for SenderwithCodeMaybe).

Can you say this about SPAMCOP, NOABUSE, REVDNS an Co? 

I consider the second test checking for unreadable sequences a lot more
"dangerous" For this we gave them only a small weight: 2 and 1 on a
20-point-weighting system. Probably 2 points are already to high.

For all SPAMCHK-Users:
We consider to add the following consonant-sequences to the
FreqConsSequences-parameter:

        sts,stm,adm,str,wsl

This should cover from-adresses containing PoSTMaster, ADMinistrator,
NeWSLetter, ...

Markus



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