I use mail (I believe it is actually mailx in FreeBSDs case, anyone feel free to correct me) and have thought about using it for regular e-mail on occasion...
It's simple enough that it fits into the category of
/bin/ed but is useful in a pinch.
Mutt which seems to be very highly recommended here 0.o, is without a doubt the best MUA available -- if you are willing to put up with having to install it on the machine rather then using mail, you won't be displeased once you learn how to use it. You might even find yourself using mutt for regular e-mail as well if you use it enough !
I've always considered the lit' mutt the vim of MUA's ;-)
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Thou shalt check the array bounds of all strings (indeed, all arrays), for surely where thou typest ``foo'' someone someday shall type ``supercalifragilisticexpialidocious''.