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mail-transport-agent (6)

'Ec' supports reading, composing, and filtering messages. It can send and receive mail to and from POP3 and SMTP servers, and route mail using sendmail, exim, and qmail. It also supports base-64 MIME attachments and multiple accounts.
Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet. It was originally based on Smail3, and has a similar configuration style, but has developed a more flexible and extensive set of facilities. The developers warn that v. 4.00 has had many changes, including incompatible changes to the run time configuration file.
NNCP (Node to Node copy) is a collection of utilities simplifying secure store-and-forward files, mail and commands exchanging. This utilities are intended to help build up small size (dozens of nodes) ad-hoc friend-to-friend (F2F) statically routed darknet delay-tolerant networks for fire-and-forget secure reliable files, file requests, Internet mail and commands transmission. All packets are integrity checked, end-to-end encrypted (E2EE), explicitly authenticated by known participants public keys. Onion encryption is applied to relayed packets. Each node acts both as a client and server, can use push and poll behaviour model. Out-of-box offline sneakernet/floppynet, dead drops, sequential and append-only CD-ROM/tape storages, air-gapped computers support. But online TCP daemon with full-duplex resumable data transmission exists.
PyEximon is a GNOME monitor/manager for the popular unix Mail Transfer Agent, Exim.
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GNU UUCP (a.k.a. Taylor UUCP) is a free implementation of UUCP (Unix-to-Unix Copy), a set of utilities for remotely transferring files, email and net news between computers.
'vthrottle' is an implementation of an SMTP throttling engine for Sendmail. It lets sysadmins control how much email users and hosts may send, hindering the rapid spread of viruses, worms, and spam. Exceptions can be made via a whitelist mechanism, which can be generated manually or with the included tool 'vmeasure'. 'vthrottle' tells the misbehaving client to hold on to the deferred mail and resend it later. 'vthrottle' evaluates mail transactions at the connection, the HELO (or EHLO) statement, and the stated source address of the mail. For each of these, a list is traversed and the observed time interval between observations is evaluated. If the observed interval is shorter than the policy interval, the mail is blocked by sending a failure reply code to the SMTP client; the message is then queued. Because 'vthrottle' uses libmilter, it will not work with other MTAs, only with sendmail.

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