Setting up Mail Server? MX records, etc

I would like to set up an email server on my home computer. I did it once
before and forget the process. I recall needing to use some free DNS service
so that my computer has an IP or something to that effect. Do I really need
to do that? I plan on uing my web host email address as the return and so I
am not interested in having people email to a POP server on my home
computer.

Anyway, I am just a little confused...

thanks,

brian


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