How to have your own exim SMTP server only deliver at set hours

I've been thinking that something like the Thunderbird Send Later add-on would be better handled on the server side (running your own private SMTP server) so you don't have to keep your desktop running until the scheduled delivery time. I'm using Debian and exim with the split configuration option so the files referenced will directly apply to that.

The correct contents for /etc/hostname and /etc/hosts on GNU/Linux

This is a short description of what the correct contents of /etc/hosts and /etc/hostname on a GNU/Linux (or another UNIX-like) system is. Here's what to take away from this discussion on LinuxQuestions.