VMailMgr (short for Virtual MAIL ManaGeR) is a package of programs designed to manage multiple domains of mail addresses and mailboxes on a single host. It co-operates with qmail for mail delivery and program control. It features: * A password checking interface between qmail-popup and qmail-pop3d which replaces the usual checkpassword, as well as an authentication module for Courier IMAP, that provide access to the virtual mailboxes by one of three methods: o IP-based virtual server access (invisible to the POP3 user) o username-based access (username-virtualuser) o hostname-based access (virtualuser@virtual.host or virtualuser:virtual.host) * CDB-based password tables to speed up access for domains of any size. * Tools to setup a virtual domain, add and delete individual virtual users and aliases, and to change passwords. CGI programs to accomplish the * above tasks from a set of web pages. * A native PHP library to compliment or replace the CGIs. * A daemon process that securely directs the operation of the CGIs and PHP code. * A separate delivery agent that automatically deals with any address inside a virtual domain from a single .qmail-default file.