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NGINX [Engine-X] is an HTTP(S) server, HTTP(S) reverse proxy and IMAP/POP3 proxy server written by Igor Sysoev. It has been running on many heavily loaded sites, including Facebook, Zappos, Groupon, LivingSocial, Hulu, TechCrunch, Dropbox, Tumblr and WordPress.
Dovecot is an open source IMAP and POP3 server for Linux/UNIX-like systems, written with security primarily in mind.
Fetchmail is a full-featured, robust, well-documented remote-mail retrieval and forwarding utility intended to be used over on-demand or permanent dynamic-address TCP/IP links (such as SLIP or PPP connections). It supports every remote-mail protocol now in use on the Internet: POP3, IMAP4r1, ETRN ... [More]
The Cyrus IMAP server differs from other IMAP server implementations in that it is generally intended to be run on sealed servers, where normal users are not permitted to log in. The mailbox database is stored in parts of the filesystem that are private to the Cyrus IMAP system. All user access to ... [More]
Archiveopteryx is a mail server system optimised for long-term storage and heavy access. It comprises a set of server programs that provide access to mail stored in a relational database (PostgreSQL). It runs on Linux, FreeBSD, NetBSD, OpenBSD and Mac OS X.
Mailster is a project aimed at testing software mail capabilities. It provides a mail server container to test emails sent by your apps without rewriting your application code.
VMime is a powerful C++ class library for working with MIME messages and Internet messaging services like IMAP, POP or SMTP. With VMime you can parse, generate and modify messages, and also connect to store and transport services to receive or send messages over the Internet. The library offers all the features to build a complete mail client.