I have a local network 10.0.0.3 - NT machine 10.0.0.2 - RedHat running Courier

I am wanting to use 10.0.0.2 as my mail server. POP3 and IMAP both work and I
can send to external mail accounts (i.e. some...@yahoo.com), but I want to be
able to send email to myself using my own domain name (a made up one, not one
actually registered and setup in DNS)

If I send mail to ryan@adrenalinerh I get an error message because the name is
not a fully qualified domain name.

If I send mail to ry...@adrenalinerh.com everything seem to send ok, but no mail
gets sent to my account. It just disappears.

I've tried putting '@adrenalinerh.com: ryan' in
/usr/lib/courier/etc/aliases/system.my but that doesn't seem to work. I've also
tried putting '.adrenalinerh.com' in /usr/lib/courier/etc/locals with no luck
either.

I would like to eventually use my redhat box as a mail host for friends with
their own domains. To do this I just need to get aliases working, right? I
have to put '@theirdomain.com' in my /aliases/whatever file and also create a
unix user for them? What am I missing?

thanks, ryan