ok, this is an argument. I just see, if I filter freemailers with
wrong IPs, domains without open port 25 and my own domains I get
rid of more than 95% of spam.
right now, if I filter out mail with invalid characters in the subject
line, I get rid of more than 75% of the spam I receive. but sooner or
later spammers will learn to encode in rfc 2047.
spammers interpret filters as damage and route around them.
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