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The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, Webmail, calendaring, and mailing list services.
Highly scalable/configurable Messaging Platform allowing users in a domain to be distributed on multiple hosts, has multiple queues. Provides virtual domains/users in MySQL. Modern MSP class qmail replacement with ESMTP, POP3/IMAP, QMTP, QMQP support
OneLDAP is a limited LDAP server that is a proxy to other common protocols, such as POP3 and IMAP. It provides basic SEARCH and BIND functions for standard LDAP authentication. It is based on the shell backend function of OpenLDAP. Release files are available at the project website.
slapd-cyrus is a slapd backend, used to translate LDAP DIT into Cyrus IMAP-server configuration. It can manage user folders, shared folders and ACLs of shared folders.
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Restores Cyrus (IMAP server) emails from Cyrus file repository. It crawls Cyrus file repository, finds emails and adds them to an IMAP server, preserving folder structure.
FreeYourEmail frees you of: proprietary APIs, HTML web pages, Mail clients, etc... It can incorporate multiple email accounts (GroupWise, Yahoo!, etc...) and provide a single download point. It can offer other information: Weather, Stock quotes, etc..
A web-based helpdesk ticketing system. It adopts a more effective ticket sorting/ranking method instead of the cumbersome "assign/completed". More: http://www.upoint.info/cgi
CleanPOP de-spams and expires emails from a POP3 server based on matching emails in your local mbox file, so local anti-spam tools can be used to clean your remote inbox. It is also useful for fetchmail users, who have no option to *delete after X days*