You will also need to look into setting up MX records in DNS, as well as a rDNS record for the mail server.
If you plan to host this on your home connection you will need to look at a service that will map those DNS entries to your Dynamic IP Address, such as dyndns.org.
Also if you are hosting from your home dynamic IP connection, please understand that many people will block accepting mail from you because you are on a Dynamic IP address block list
.. you will then want to use a mail forwarder (your ISP's SMTP Server)
Just want to make sure you go into this with both eyes open..
The Perfect Setup How-To's
cover mail server as well as other items on Suse..