Not much of an issue but I just noticed...
If I run a server on a different port than port 80, the port number - which is part of the url in this case - will make it into the suggested sender address in the Contact Form configuration.
http://mydomain.com:8080 --> [email protected]:8080
I'd guess that's easy to fix.
Yeah, we could check for and strip port numbers off of the server name pretty easily... should be fixed now in /include/tool/email_mailer.php