Exim
Exim is an open source mail transfer agent (MTA), which
is software responsible for receiving, routing, and delivering e-mail
messages (this type of program is sometimes referred to as an Internet
mailer, or a mail server program).
Exim is highly configurable, and has features that are lacking
in other MTAs. It has always had substantial facilities for mail policy
controls, providing facilities for the administrator to control who may
send or relay mail through the system. In version 4.x this has matured
to an Access Control List based system allowing very detailed and
flexible controls.
Exim somewhat resembles Smail 3, but it has diverged and now
surpasses it in user friendliness and flexibility.
Features include:
- RFC 2821 SMTP and RFC 2033 LMTP email message transport
- Incoming (as SMTP server):
- SMTP over TCP/IP (Exim daemon or inetd)
- SMTP over the standard input and output (the -bs option)
- Batched SMTP on the standard input (the -bS option)
- Supports RFC 5068 Message Submission, as an SMTP server
with (for
example, encrypted and authenticated connections on port 587)
- Outgoing email (as SMTP or LMTP client):
- SMTP over TCP/IP (the smtp transport)
- LMTP over TCP/IP (the smtp transport with the protocol
option set to “lmtp”)
- LMTP over a pipe to a process running in the local host
(the lmtp transport)
- Batched SMTP to a file or pipe (the appendfile and
pipetransports with the use_bsmtp option set)
- Configuration
- Access Control Lists - flexible policy controls
- Content scanning, including easy integration with and
other spam and virus scanners like SpamAssassin and ClamAV
- Encrypted SMTP connections using TLS/SSL.
- Authentication with a variety of front end and back end
methods, including PLAIN, LOGIN, sasl, dovecot, spa, cram_md5
- Rewrite - rewrite envelope and/or header addresses using
regular expressions
- Routing controls - use routers to redirect, quarantine,
or deliver messages
- Transports - use transports to deliver messages by smtp,
lmtp, or to files, directories, or other programs
- Flexible retry rules for temporary delivery problems
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Last Updated Sunday, November 25 2012 @ 12:39 PM EST
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