Exim is used extensively all around the world.
Exim is licensed under the GPLv2 license. This guide focuses on deploying, configuring, and discussing best practices and security concerns for Exim, Postfix, Sendmail, and Qmail.Įxim is an MTA (Mail Transfer Agent) for Unix-like operating systems first written in 1995 by Philip Hazel. Today, with the widespread availability of easy and low-cost cloud-hosted server providers, anyone can setup their own email server. All three of these email platforms, and Qmail, were originally developed for Unix-Like or Linux based Operating Systems.
The top three email servers on the internet are Exim (with over 55%), Postfix (over 30%), and Sendmail (about 4%). However, according to the survey, three types of email servers account for more than 95% of the global market share: Given the long history of email (dating back to 1971), and the massive number of email servers online, you’d be right to assume that there are many different email server platforms available. According to a 2019 survey from ( ), there are approximately 1.8 million email servers online! The Four Horsemen of Linux Mail Transfer: Exim, Postfix, Sendmail, and QmailĬonsidering how important and popular email is today, it shouldn’t surprise anyone that there are millions of email servers currently operating on the public internet.
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