Vpopmail provides support for hosting virtual emaildomains on mail servers running qmail. It easilysupports from 1 to over 100,000 domains. It alsosupports from 1 to millions of email accounts per domain.It automates and simplifies many of the tasks needed to manage virtual domains . User authentication informationcan be stored in hash files, mysql, oracle, sybase,postgreSQL or LDAP. The programming API simplifieswriting addon software, such as qmailadmin, vqregisterand many other vpopmail compatible programs. vpopmail has an active development and supportcommunity and is running world wide in at least80 different countries.