BATV basically does what you want to do. It wouldn't work for DynDNS because it needs to be implemented at the MTA and they don't generally control the MTA. (at least I think it wouldn't work)
Larry Seltzer eWEEK.com Security Center Editor http://security.eweek.com/ http://blogs.eweek.com/cheap_hack/ Contributing Editor, PC Magazine [EMAIL PROTECTED] _______________________________________________ Fun and Misc security discussion for OT posts. https://linuxbox.org/cgi-bin/mailman/listinfo/funsec Note: funsec is a public and open mailing list.
