POP: Post Office Protocol Popular method of email delivery for intermittently connected hosts

Email Lists Management and implementation of electronic mailing lists including Mailing list management (MLM) software. bulk emailers, et al.

Email Processing Automatic processing, Archives, formatting for WWW, autoresponders

Email User Agents User interface for reading and composing email

Email for file transfer and MIME methods of using email for file transfer, including Multi-purpose Internet Mail Extensions (MIME) related topics

Electronic Mail broad overview of electronic mail

Up to Electronic Mail - broad overview of electronic mail software, protocols, et al.

Up to Person to Person Communications - Interpersonal Communications. IRC, BBS, email, paging, write, talk

Up to Communications

Exim Mail Transport Agent (MTA) - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It has many controls on usage, relaying etc. It can replace sendmail, although the configuration is rather different. {(L)GPL}

Trestlemail - Trestlemail is a Mail Delivery Agent that works with Fetchmail to automatically redistribute multi-drop mail. Many ISPs dump all mail to a domain into a single global mailbox. Fetchmail will fetch the multi-drop mail and Trestlemail will distribute it. {(L)GPL}

xpostconf - A graphical configuration tool for postfix {(L)GPL}

VirtMail - VirtMail is a virtual email hosting solution written in Perl, utilizing a simple program-based interface that can easily work with any MTA, an SQL backend for maximum performance and scalability, and Web-based administration with delegatable permission {oss}

Courier Mail Server - Courier is a fully functional SMTP/IMAP/POP3/HTTP (webmail) server. Courier implements many SMTP extensions: DSN, PIPELINING, 8BITMIME. Courier also implements several new SMTP extensions for mailing list management and spam filtering. {(L)GPL}

QwikMail - Qwik SQL Webmail Server - Qwik SQL Webmail Server is a package of Perl scripts and an SMTP server that together become a heavy-duty webmail system that is able to handle many user accounts. {(L)GPL}

Other Applications and Utilities

Inactive Orbits: (Not included on this page)

Net::SMTP - Interface to the Simple Mail Transfer Protocol (SMTP). SMTP is how most Internet computers communicate when they're exchanging mail. Part of the libnet bundle. [Perl] {oss}