proper mailname

[Tyler Smith <tyler.smith@mail.mcgill.ca>]

Hi,

I'm using exim/fetchmail/mutt to send and receive mail. However, I've
noticed that several programs that try and send me messages are
confused - things like sudo and at, which try and mail messages to
root@sedgenet or tyler@sedgenet. sedgenet is just a made-up domain I
picked when I set up my laptop, but now I see that I need to tweak
something so that system-generated emails are properly routed. So
should I change my etc/mailname, or is there some way to set an alias
such that tyler@sedgenet and root@sedgenet are actually delivered to
real email addresses.

Thanks!

Tyler