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The venerable MH message handling system: a command-line based mail user agent for UNIX/Linux developed at the RAND Corporation and the University of California, Irvine.
Veldfire is a frontend to the Riverdrums C library, and is aimed at simplifying email functionality. The project provides interfaces to sending email, attaching files and sending mail to lists.
Edbrowse is a comprehensive editor, browser, and email client that provides access to the net through a command line interface, appropriate for speech or braille. It also supports scripting, to interact with the net in the background, or in batch mode.
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Deliver is a file transfer protocol and implementation designed to be a safe, open-source alternative to the most extended transfer protocols like the traditional e-mail.
This program is a minimal SMTP client that takes an email
message body and passes it on to a SMTP server (default is the
MTA on the local host). Since it is completely self-supporting,
it is especially suitable for use in restricted environments.
Small SMTP wrapper designed to be used in chroot-ed environment as a sendmail command-line tool replacement. e.g. warpper can be used by php ( by function mail ) instead of using SMTP client written in php
Heirloom mailx (formerly known as "nail") is intended provide the functionality of the POSIX mailx command with additional support for MIME messages, IMAP (including caching), POP3, SMTP, S/MIME, message threading/sorting, scoring, and filtering.