tpop3d is yet another POP3 server. It is intended
to be fast, extensible, and secure. It is
especially extensible in regard to its
authentication subsystem. Supported authentication
mechanisms include auth-pam (Pluggable
Authentication Modules) and auth-passwd to mediate
access between users and their Unix-style
mailboxes, auth-mysql which uses vmail-sql to
mediate access to virtual-domain email, auth-ldap
which allows authentication of users against an
LDAP directory, auth-other which allows you to
authenticate with an external program
communicating via pipes, and auth-perl which
allows you to authenticate users with custom Perl
code. There is integrated support for
POP-before-SMTP relaying. tpop3d supports
traditional (BSD-format) mailspools and the
maildir format of qmail.
