Simple Text Mail Setup

[Rem Roberti]

First of all I want to thank all who responded to my question, but I
gotta tell you, if it isn't one thing it's another.  I opted to install
msmtp, and it did just what I hoped it would do, working perfectly out
of the box, including TLS.  But now...I can't receive mail.  As you
recall from my first post I indicated that I could receive email, using
mutt and getmail, and indeed I can, on my laptop, which was set up by
someone who knew what they were doing.  The computer in
question is a desktop with a virgin installation of FreeBSD 7.0.  I
obviously spoke too soon.  I have mutt and getmail installed, 
and now I can send from that computer, but when I try to receive 
I get error messages (maillog) saying, among other things:

DSN:Data format error
Invalid hostname
stat=User unknown
savemail panic
savemail cannot save rejected email anywhere

I have a feeling that this is a no brainer, probably related to what is
or isn't stated in my rc.conf.  But my newbieness has me on the ropes
once again.  Any help would once again be appreciated.

Rem