I recently discovered that I could send mail from home to my account at work using a sender name of an IMail alias! I did another test with a completely nonexistent address and the mail was delivered!
I'm not sure why you seem surprised -- you can do the same thing with Bill Gate's E-mail address. Or mine. Or whoever's you would like. That is how SMTP works -- the return address is just like the one on an envelope. It is intended to show who sent the E-mail -- but there is nothing guaranteeing that it is correct.
Have you never received a spam from someone pretending to be @hotmail.com or @yahoo.com?
Again, that's why so many people are looking at SPF ( http://spf.pobox.com ). You can very easily add an SPF record for all of your domains, helping ensure that people won't send unauthorized E-mail from your domains. And, using Declude JunkMail, you can block any unauthorized E-mail from SPF-enabled domains.
-Scott
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