Help with setting up mail on a Redhat server

Well now that I have finally built PHP, Apache and MySQL nicely and my site is online, I need help setting up mail.

Question 1:
What should my MX entry look like? I use namecheap.com right now.

Question 2:
I have no idea what to change from my local default settings. I think something is wrong, because apache still thinks that my admin email is root@www.shadar.net ... should the www be there? I'm wondering if I put an extra www in some config file for my domain. So I guess the question is "Will having www on my mail domains mess up my ability to send/get email?"

Question 3:
The server is not listening on the SMTP port.... but it kinda is too... if I telnet to localhost it works, but if I hit it from my home PC, it is not listening. I doubt my host is blocking that port, so I think there may be some server configuration issue

Question 4:
When I open webmin and send a mail from my root mailbox to my hotmail address, I never see it on hotmail nor do I get a delivery failure notice... what is up there?

Any help you can provide would be great

-Brandon

 

 

 

 

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