I apologize, I just double checked and I think the "mailutils" package
is the more common one. You shouldn't need a database for it. However,
I'd check to make sure you don't already have it the mail command in
your system.
Check your PATH by typing "env | grep PATH" in the command line and
check that /usr/bin is listed. As well, type "ls /usr/bin | grep mail"
and check if you see a mail command. You don't really need postfix for
this anyways, exim which comes on lenny by default is enough for such a
simple task.