[gentoo-user] Need advice in selecting a mail server

[Michael Sullivan]

I have three boxes (baby, camille, and catherine) in my LAN, and for
some reason (this was years ago) I set up an exim server on each of
them.  camille and catherine were supposed to forward their mail to
baby, which has a working dovecot server.  Now, nothing from catherine
is going through, and only mail sent from cron on camille is going
through, and everything on baby is being delivered.  Some time a couple
of years ago my daily logwatch reports stopped coming (all of them) and
earlier this year my portage elogs stopped getting mailed to me.  I
would like to replace all of them with something simple (like ssmtp),
but I'm not sure what the setup on baby needs to be so that I can still
access my hundreds of saved emails on the dovecot server.  Every time
emerge on camille or catherine tries to send an elog I get the 451
error.  I can't seem to find the attempts in the log files.  Anyway, can
I use ssmtp on baby to receive/store network mail, or do I need
something extra like exim/sendmail?