Exim
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| Original author(s) | Philip Hazel |
|---|---|
| Developer(s) | The Exim Maintainers |
| Initial release | 1995 |
| Stable release |
4.88 / December 25, 2016
|
| Development status | Active |
| Written in | C |
| Operating system | Unix-like |
| Platform | Cross-platform |
| Type | Mail transfer agent |
| License | GNU General Public License |
| Website | www |
Exim is a mail transfer agent (MTA) used on Unix-like operating systems. Exim is free software distributed under the terms of the GNU General Public License, and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail.
Exim has been ported to most Unix-like systems, as well as to Microsoft Windows using the Cygwin emulation layer. Exim 4 is currently the default MTA on Debian GNU/Linux systems.
A large number of Exim installations exist, especially within Internet service providers and universities in the UK. Exim is also widely used with the GNU Mailman mailing list manager, and cPanel.
In April 2016 in a study performed by E-Soft, Inc., approximately 54% of the publicly reachable mail-servers on the Internet ran Exim.
The first version of Exim was written in 1995 by Philip Hazel for use in the University of Cambridge Computing Service’s e-mail systems. The name initially stood for EXperimental Internet Mailer. It was originally based on an older MTA, Smail-3, but it has since diverged from Smail-3 in its design and philosophy.
Exim, like Smail, still follows the Sendmail design model, where a single binary controls all the facilities of the MTA. Exim has well-defined stages during which it gains or loses privileges.
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