Vpopmail

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vpopmail is a free GPL software package, to provide an easy way to manage virtual e-mail domains and non /etc/passwd e-mail accounts on your qmail or Postfix mail servers. Originally developed by Inter7 it has become a large open source project with a large community supporting it.

[edit] Benefits

Support for 1 to 23 million virtual e-mail domains using a "grow as it goes" balanced directory tree.
Support for 1 to 23 million e-mail users per domain using the same balanced tree structure.
Automates all qmail configurations into handy and scriptable command line programs and documented API library calls.
Automates Unix user/group/other permissioning of directories and files.
Supports authenticated relay control of your qmail smtp server.
Needs only one user in /etc/passwd for all email accounts.
Supports name or IP based virtual domains
Configurable logging.
Support for MySQL, Oracle, PostgreSQL, /etc/passwd, /etc/shadow LDAP, Sybase, and default cdb authentication storage.
Delivers directly to Maildir for use with qmail-pop3d, .qmail files or any other Maildir program.
No need to have hundreds of .qmail files for virtual domains. Each domain gets its own directory under vpopmail user with a unique password file for each domain.
Documented command line programs that can be used in scripts or for remote admin.
Documented C library for all vpopmail features and transactions.
Deamon to allow you to manage mail accounts via TCP/IP control port.