Couple of things.
I know you said you do not want to install a webmail service on your Linux box, but it wouldn't hurt to load sendmail. If you did, that would probably fix your problem. Depending on your verison of Linux, it should be as simple as installing an RPM.

The other thing you can do, if all else fails, is this
http://www.nukemods.com/modules.php?...ewtopic&t=3543