It's actually not particularly hard.
Server-side, if you have the server doing cyclic
redundancy checks, or hashes and storing them for each
e-mail message, then not allowing the message to come
through more than say, 4 times in total...and not more
than once to a single person - you can block mass
messages --- this being much more effective the more
users you have...
The ISP would likely also have a growing list of
blocked e-mail addresses (to known spammers) that
would automatically get deleted...and possibly some
keyword checking "big sale" or "free pron" etc.
For anti-virus, you simply have a scanner checking for
the main virii going around and auto-matically
deleting them if they're being received.
- W0rm
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