I currently am localhost.localdomain do I just change that whole thing to one word, or do i have to change it to my hostname.mydomain.com?

k, I got it to stick finally. In case anyone else comes accross this. I had to edit two files. the /etc/sysconfig/network and the /etc/hosts. I'm not too sure if I needed to edit the hosts file, but it works.

The mynetworks parameter that really confuses me. what do i put there?

Your domain name and any other domains you wanna receive mail for. This doesn't mean that you WILL recieve the mail, it simply means you'll allow it. You won't relay for spam though if you don't specify their domain, that's the nice part.

Short answer:
Your domain, your hostname and any hosts on your network or domains you wanna recieve mail for.

Cool

well, on this page here http://www.redhat.com/support/resour...OWTO/x118.html it kinda shows, and explains things, but I am extremely lost.
so, what I THINK this is saying is I have to put the LAN ips for my other computers, and my router? plus "/a number"??

Yes you do, that's for relaying If you don't your computers on your network cannot send email through you or recieve it. However... You also have to put your domain name/IP (if you have no domain) for the same reason

Cool

okay, so what's the last number for? Do I put my no-ip.com name? If so, do I put that number after it as well?

Those numbers are subnet masks, it confuses the he!! outta me honestly. I just don't bother with it most of the time, if you've got a massive network or are really curious... nah, nevermind, I'll find it for you and post up the page that has all the answers on that 'last number' brb

As for putting it after your no-ip.com bit, nope. Just for local networks, you'll see..

Cool

Wow, I'm getting good at googling things occasionally!

Here ya go:
http://xtronics.com/reference/ip-subnetmasks.htm

Please feel free to feel as enlightened yet at the same time humbled as I was when I read about it. Completely helpful yet complicated as all get out.

Cool

So, I dont need those subnet masks? in esence mine will look like so
mynetworks = 192.168.1.1, 192.168.1.2, 192.168.1.3, name.no-ip.com

does that look okay to you? since i dont know how to test this? If so, I'm gonna start this bad boy up, and see what happens. LOL

That definitely looks decent to me, you can always include the subnets if you find it not working, but I go simple first then move up

Cool

okay, so...that's it? I'm done? Now what? How do I set up email addresses? Or, wait a minute, in order to set up email addresses i have to set up user accounts? Like, there's already a root@mydomain.com, no matter what?

Purty much. Check /etc/aliases OR /etc/postfix/aliases and read up on the man page. But basically yeah, create user accounts and you are done. To alias something like:
Spam@whatever.com
You just have to add it to the aliases file, something like
Spam: Bill
IF user Bill is a real user Then bill will recieve all mail sent to Spam. Nice actually. Then... After adding to the aliases file, you want to run:
postalias
To save the changes, you might need to specify the aliases file, but that'll all be covered in the man page and if you have questions, POST EM UP!!!

Cool

okay, so....that seems a little too far for me, I want to send and receive some email, to make sure the things working right (and i didnt screw anything up in the process) How do I go about setting up the account in something like Evolution? So, I go to add a new user, and it fills in the blank automatically. root@name.domain What's that about, I thought it would just be root@domain?? Also, on the next page it asks for "server type" is it pop?

or even in outlook express, what would be the incoming mail server, and the outgoing mail. "mail.mydomain"?

I tried mail.mydomain, and got the following error.
any suggestions?