Yes, lots. I think I must have said something about byte sex.
I got ads for some porn CD company - of course now I'll just get more!
I think the usenet gateway should strip (oh no...) out email
addresses from the headers, and maybe add a .sig if no email
address is found in the body (oh no...). Muck with any address
found but leave it human readable: "albert at ccs.neu.edu".
Then put 66235@some.linux.site in the headers so that appropriate
flames can be automatically sent to the offenders. The random
number in the address is to keep them from filtering out duplicates.
Repeat offenders can be tracked using some kind of cache so that
they get larger and larger chunks of /dev/urandom each time.
(a first time offender may have just made a mistake with email)