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This is a comparison of mail servers: mail transfer agents, mail delivery agents, and other computer software that provide e-mail services.
Linux based mail servers are built using a number of components because a Linux environment is, by default, a toolbox operating system. A stock Linux server already has internal mail. To allow the server to send external emails, a Mail Transfer Agent such as Sendmail, Postfix, or Exim is required. Mail is read either through direct access (shell login) or mailbox protocols like POP and IMAP.
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Maps, Directions, and Place Reviews
Feature comparison
Professional Smtp Server Video
Authentication
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Antispam features
Source of the article : Wikipedia
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