Vpopmail

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VPopMail is an open-source GPL software package used for managing virtual e-mail domains and non-password e-mail accounts on e-mail servers. It was originally developed by Inter 7.^[1]

Features

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
Automating e-mail configurations into command line programs that can be used for scripts and documented API library calls
Automating Unix user/group/other permissions of directories and files
Authenticated relay control of e-mail SMTP servers
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
Unique domains for each directory under vpopmail user with a Unique password files for each domain
Documented command line programs that can be used in scripts or for remote admin
Documented C library for vpopmail features and transactions
Daemon that manages mail accounts via TCP/IP control port