RE: Open relays and open proxies

tell me, If I am a disgruntled former employee, and I decide my best
method of revenge is to use a forging spam app to send out False
advertisements about your company, how does that fit into you thoughts?


On this note, it's becomming quite popular actually with hosted sites at
least here, that spammers are getting domain names, and sending out their
trash with return addresses of valid domains which causes thousands of
returned messages to come back to email accounts of the domains.

Sometimes you spend hours trying to explain to angry individuals that:

1. The site you host never sent the spam.

2. The customer you host must deal with the returns as best they can,
    as they come from random addresses.

If anyone else has come up with a way to effectively handle this I'd love
to hear about it.