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. License: GNU General Public License (GPL) Changes:
This release fixes a couple of memory leaks. It adds recursion into subfolders of a maildir mailbox, and adds support for SHA1 passwords. By default, changes are committed on close-after-QUIT. Support has been added for intelligent filenames in maildirs. A new authenticator auth_gdbm added has been added. Support has been added for qmail-pop3d style UIDLs. Support has been added for syslog-like log levels. The use of select(2) has been replaced with poll(2). maildir-ignore-folders may now contain regular expressions.

More...