Post.Office mta user home directory?

Are there any *nix geeks or Tenon support people out there that can help me 
with the creation of a home directory and shell for the
mta user that Post.Office runs under?

I am running SpamAssassin (SA) and I am configuring if manually.  I am trying 
to set-up the bayes learning feature of SA.  I am
running SA as the mta user (non-root) as recommended on this list.  The problem 
is that SA tries to save the various bayes related
files in various locations on the system (/var/root/ for example).  Obviously 
the mta user does not have permissions to read or
write to the /var/root/ directory.

I am guessing it is trying to do this because the mta user was created by Apple 
by default or by Tenon during the install process
and a home directory or shell was not needed and therefore not created for 
security reasons (the idea of least privilege).

Are there any reasons whey I should not do this?  I think I could figure this 
out via NetInfo but I would sure like to have another
tool in my expanding CLI toolbox.

Thanks,

Dan

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