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Comparison of mail servers

  The   comparison of mail servers   covers   mail transfer agents ,   mail delivery agents , and other   computer software   that provide   e-mail   services. Unix -based mail servers are built using a number of components because a Unix-style environment is, by default, a  toolbox [1]  operating system. A stock Unix-like server already has internal mail; more traditional ones also come with a full  MTA  already part of the standard installation. To allow the server to send external emails, an MTA such as  Sendmail ,  Postfix , or  Exim  is required. Mail is read either through direct access ( shell  login) or mailbox protocols like  POP  and  IMAP . Unix based MTA software largely acts as enhancement or replacement of the respective system's "native" MTA. Microsoft Windows  servers do not natively implement email. Windows-based MTAs therefore have to cover the whole set of email-related functionality. Contents 1 Feature comparison 2 Authentication 3 Antispam features 4
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