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Top 20 Best Linux Mail Server Software and Solutions in 2020

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  1. Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.

  2. Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

    OVH VPS Postfix can't receive external emails about 4 months ago

    Read the documentation on postfix.org and/or buy one of the many available Postfix books (it really helps to understand the Postfix philosophy).
  3. Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

  4. Axigen is an integrated email, calendaring & collaboration platform, built on a Linux mail server technology.

  5. Is a collaboration suite (messaging and groupware).

  6. Sendmail is a general purpose internetwork email routing facility that supports many kinds of...

    Sendmail and Exchange online - 550 5.1.10... about 4 months ago

    We are using sendmail and Exchange online with to different identies. We are experience problem that we want to receive Teams invitation to our @ sendmail.com address, when I forward teams invitation fromexchange online identite to "sendemail" identetie we are getting error.
  7. qmail is the name of an advanced level of mail transfer agent for the UNIX based operating systems.

  8. Modoboa is a mail hosting and management platform including a modern and simplified Web User Interface.

  9. A fully fledged, free email server solution, an open source project (GPL v2).

  10. Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

    Why self hosting is important about 6 days ago:

    Mail-in-a-box [0] has a very good mail filter. Junk mail is about at Gmail levels for me, with almost zero false positives and almost zero false negatives. Some of my accounts are fairly high volume and I have found its performance to be very acceptable. The fact that I can host as many domains and accounts as I want with all kinds of filters and rules and forward them all to my main account as needed with rules...
  11. KG

    Kolab Groupware

    This hasn't been added to SaaSHub yet

  12. Apache James is a pure Java SMTP, POP3 enterprise mail server.

    Imap mailserver for testing and development about 3 months ago

    Check out Apache James. My unfinished dockerized instance: https://github.com/alexanderfefelov/docker-backpack/tree/main/james.
  13. CMS

    Courier Mail Server

    This hasn't been added to SaaSHub yet

  14. ZS

    Zentyal Server

    This hasn't been added to SaaSHub yet

  15. DMS

    Dwarf Mail Server

    This hasn't been added to SaaSHub yet

  16. OXM

    Open-Xchange Mail

    This hasn't been added to SaaSHub yet

  17. CIM

    Cyrus IMAP server

    This hasn't been added to SaaSHub yet

  18. HWM

    Horde WebMail

    This hasn't been added to SaaSHub yet

  19. MailerQ is a high performance Mail Transfer Agent (MTA) designed for delivering large volume email messages at very high speeds.

  20. maildrop is a Mail delivery agent used by the Courier Mail Server. The maildrop MDA also includes filtering functionality. maildrop receives mail via stdin and delivers in both Maildir and mbox formats.