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Sendmail is a server program that exchanges e-mail with other servers. - Sendmail is the most popular such program; more e-mail on the Internet passes through Sendmail than any other e-mail server software.
- Sendmail is very old, having been originally developed in the early 1980s.
- Sendmail is very complex because of backwards compatibility concerns as well as support for powerful features.
- Sendmail is widely supported. Lots of e-mail package add-ons work seamlessly with Sendmail.
Due to its popularity and complexity, Sendmail is a prime target for hackers to attack. See http://www.sendmail.org/ for more information on Sendmail.
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