Setup SMTP/Pop3 with IP address

Sorry, total beginner with mail servers, but I've got an Ubuntu box at Rackspace which only has a fixed IP address. I would like to setup postfix to use this rather than a domain, is that possible??
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Silas2Author Commented:
I looked at those posts, I couldn't see any mention of using a fixed IP.
I'm looking at where every all the examples are showing, can I use a fixed IP address for that? I heard that mail servers need an MX record to receive mail, does that require a domain?
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