>We are having trouble with a spammer who registers new domain names every
>day and spams our customers from a DSL line with a dynamic ip.

Any ideas?

sure, look at the Class C(s) he is spamming from, and block it(them) in 
mta_clients_bw.map

A.B.C 554 your text here

there is very little probability that there are legit senders to your 
clients in those dynamice ranges.

Len 


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