Has anyone here used the dyndns.org services? I've signed up and am using them to host my server as a dynamic dns address so that I can access my system from wherever even if AT&T decides to change my ip address on me. My question is are any of you using this service with the mail exchanger option? I want to serve mail from my system, but their faq doesn't really explain alot and I don't know what information I'm supposed to provide in the "mail exchanger" dialog box. Is it supposed to be my hostname, the hostname of AT&T's smtp server, what? Any help would be appreciated. Thanks.

www.no-ip.com works pretty well for me.