#2 anti-spam

[Anonymous]

A suggestion is to add an anti-spam tracker on every
message sent, with an id number for the sender IP,
which is stored in a database, so that if someone is
spamming thru your computer, people can easily track it
back to your system, and you can easily track it back
to the offending IP

[Richard Freytag]

Logged In: YES
user_id=1590428

This assumes you and your database are known to be reliable.
In the "real world" a scheme that requires unauthenticated
trust will immediately be spoofed by spammers pretending to
blame someone else. As it is spammers are faking the
"FROM:" email line and pointing the "finger" at someone's
Mailer is just as simple and obvious.

But if I missed your point do let me know.