I hope I'm describing this adequately. If not, let me know. I really need to get this controlled. Seems to me a disgruntled employee can continue using his email address to send messages to the company even after I've deleted them from my server.
Yes, but only if he has access to send the E-mail. And if he does, you haven't fired him well. :)
Well, I can't fire him enough that he doesn't use his home computer's POP client that's previously been configured with his (once valid) user, to send messages to our domain; maliciously or inadvertently.
Well, yes, he can do that. But anyone can. If you check, you'll probably find that a lot of the spam sent to your users has the return address of someone else on your domain.
I guess I'm further surprised that this can't be disallowed.
It's just how SMTP works -- and why people are starting to get very interested in SPF. With SPF, you can say something like "Anyone using a @bookmans.com return address must send from an IP address listed in the MX record of bookmans.com", to help prevent this from happening. Not only that, but it also helps prevent that ex-employee from using his old address to send mail to people elsewhere.
See http://spf.pobox.com for more details.
-Scott
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