well how come the software can't detect that the person sending the email isn't a valid user?
Because there just isn't any way to do that (no mailserver in the world that I know of attempts to determine that the return address is valid).and the rtf@mydomain would not be a valid address on the domain.
You *could* try starting an SMTP transaction with the @mydomain.com mailserver, and see if it appears to accept mail for [EMAIL PROTECTED] But, it often will say "OK, I'll accept mail for that user", when it will in fact later reject the E-mail. Or, in some rare cases, it may say "No, I won't accept mail for that user" when in fact the address is valid. And, many domains have a "catchall" account, and accept all E-mail -- so even if you know the E-mail was delivered, that doesn't mean that the account exists.
-Scott
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