Add support for mbox (/var/spool/mail) style mail spools
Name Category Description
mutt mail-client A small but very powerful text-based mail client
popa3d net-mail A security oriented POP3 server
postfix mail-mta A fast and secure drop-in replacement for sendmail
procmail mail-filter Mail delivery agent/filter
sendmail mail-mta Widely-used Mail Transport Agent (MTA)
tpop3d net-mail An extensible POP3 server with vmail-sql/MySQL support

Thank you!