They don’t need to know how to send a message to its intended recipient they know only about delivering mail to a specific generally server-based MTA, which is then responsible for routing email to the ultimate recipient. ![]() ![]() MUAs have only a very basic concept of how to deliver mail. MTAs handle delivery of email and mail user agents (MUA) such as GNOME’s Evolution, KDE’s KMail, and Mozilla Thunderbird let users create and manage messages. There has always been a division of labor for email processing. It was the only viable open source mechanism for delivering email at the time Linux was introduced to the world, so it became the default MTA provided on many Linux distributions. One of the earliest MTAs, Sendmail, became extremely popular for dealing with the delivery of email across multiple networks. Many years ago, before the Internet standardized on Simple Mail Transfer Protocol (SMTP), applications known as mail transfer agents (MTA) were designed to help process email and determine the best route for message delivery. ![]() That’s the perfect place for a simpler solution: sSMTP. But Sendmail’s rich mail server features aren’t an ideal solution for the typical desktop user whose primary mail support is delivered through a remote ISP. ![]() Linux distributions have relied on the venerable Sendmail package since the early days of Slackware.
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