Help I am so lost.

Linode =/= Amazon EC2……….

Don't know exactly what you're trying to do with your mail server, but maybe you need to follow a better tutorial. The one you linked to is too complicated and also outdated. Here's something you can just copy and paste into your ssh screen.

http://www.howtoforge.com/virtual-users … ubuntu8.04">http://www.howtoforge.com/virtual-users-domains-postfix-courier-mysql-squirrelmail-ubuntu8.04

SMTP authentication has nothing to do with SSL: they are completely totally unrelated. SMTP authentication just tells the mail server that you are X user and trusts your assertion when you provide it the correct user/pass. SSL encrypts the communication between your computer and the mail server - but does not authenticate you.

(I'm very sorry, I actually don't know what you're problem is or how to fix it… I just wanted to provide that tidbit because I think it's important to know the difference.)

@taewoo:

Help. I am so lost.

Yeah I know exactly what you mean. The best thing I did for my Linode box was to install virtualmin - it does all that grunt work for you and you can just configure what you like through a browser interface.

(usual disclaimers about similar products apply blah blah blah)

@MrNod:

(usual disclaimers about similar products apply blah blah blah)

ISPConfig (http://www.ispconfig.org) is even easier. A bit tricky to set up in the first place, but once you follow the copy-and-paste tutorial to get it up and running, everything works right out of the box. (But don't use version 3.x yet)