This is a comparison of mail servers: mail transfer agents, mail delivery agents, and other computer software which provide e-mail services.
Note
Linux based mail servers are built using a number of components due to the fact a Linux environment is by default a multi-user operating system. When you deploy a Linux server it already has internal mail. To allow this server to send external emails you need a MTA (Mail Transfer Agent) such a sendmail, postfix and exim. If you wish users to not have direct access to the server and have to physical login to read there emails, then you need to give those users access to the emails received by the MTA, then you install an additional service like Dovecote or UW IMAP which provide the POP and IMAP services for your mail server.
Read more about Comparison Of Mail Servers: Feature Comparison, Authentication, Antispam Features
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