You need to either get him to change the way he sends his emails or adjust
your scores!

If he is sending directly from a dynamic IP address then he will be blocked
by a lot of peoples filters - for instance there is no chance of his emails
being accepted by AOL!

The way round this is for him to relay through his ISPs outgoing mail server
if at all possible. i.e. put smtp.ispname.com (or somthing like that) in the
outgoing server address of his email client.

If you want to accept emails from people with a similar setup to his without
adding them manually to a whitelist, then you will have to reduce the scores
for the rules which fire on these mails.

Edit your local.cf file (probably in /etc/mail/spamassassin) to include
somthing like:
score FH_HOST_ALMOST_IP 1.0 
score FH_HOST_EQ_DYNAMICIP 1.0 
score RCVD_IN_SORBS_DUL 0.5 

This will still help to catch some spam (though is has reduced the amount
you will catch) but will hopefully be enough to let emails like this through
as long as they don't hit any other rules.

I would suggest NOT using the BOTNET pluggin as it will probably make the
problem worse!
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