D. J. Bernstein
Building a POP toaster
A POP toaster receives mail for authorized users
and lets them pick it up through the network.
A POP toaster has three essential components:
Some common sendmail-compatible choices:
- Mailbox storage: saving incoming messages on disk.
- Mailbox service: letting users pick up mail through the network.
- Account management: setting passwords for authorized users.
All of these work with qmail
if you continue to deliver mail to /var/spool/mail.
in the qmail package.
- Mailbox storage: mbox format in /var/spool/mail/$USER.
- Mailbox service: qpopper or ipop3d.
(Beware that all versions of qpopper before 2.51 allow
remote users to take over the machine.)
- Account management: UNIX accounts in /etc/passwd.
qmail offers another choice providing more flexibility:
qmail-pop3d's modular design
lets it work with a variety of account-management mechanisms:
- Mailbox storage: maildir format in $HOME/Maildir.
- Mailbox service: qmail-pop3d, part of the qmail package.
- Account management: See below.