Sendmail is most widely used MTA on Internet and was originally designed for Linux and Unix platforms. In early 1980s Eric Allman wrote Sendmail which was first shipped in BSD 4.1c in 1983. Earlier Sendmail was known as delivermail which was used to connect ARPANET mail to Berk Net mailer. With the rise of email, Sendmail went on to become most popular program for mail routing and delivery.

In 1996,80% of the public email servers were running Sendmail. Since then there has been a downfall in its usage and it's been said that time of Sendmail has passed, but Sendmail is still alive and kicking. Last year latest version namely Sendmail 8.14.2 was released and according to a survey done last year 29% of public mail servers are still running Send mail.

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