Spam.

Comments were recently made about replying to the sender of some
spam. I would only do this with the private stuff that gets
forwarded/forwarded/forwarded from your friends or relatives. *NEVER*
reply to "commercial" or "big time" spammers! They just use that as a
confirmation. It seems like the majority of my spam stops coming if I
simply delete and ignore. I realize this may be hard to take if you
get 50 spams a day or something:).

I have also forwarded (with headers expanded) heavy porn or money
laundering schemes to abuse@<domain>.com. I have to take a good guess
from the expanded headers to do this but I think it has yielded some
interesting results.

Some good auto filtering techniques would be interesting though.
thanks for the snippets in a previous message. They warrent some
close study.
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Please avoid sending me Word or PowerPoint attachments.
See http://www.fsf.org/philosophy/no-word-attachments.html