Zimbra Collaboration alternatives

Nearest on its board

1. 15
   PI

   poste.ioposte.io

   Poste.io is a self-hosted email server with web administration, webmail, spam protection, and mail server components in one Docker container.

   6.0 APIOpenFree Free tier · from $349/yr
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2. 17
   CI

   Cyrus IMAPcyrusimap.org

   Cyrus IMAP is an email, contacts, and calendar server.

   5.9 APIOpenFree Free tier
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3. 14
   H

   hMailServerhmailserver.com

   hMailServer is a self-hosted mail server that supports SMTP, IMAP and POP3.

   6.0 APIOpenFree Free tier
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4. 18
   MM

   Maddy Mail Servermaddy.email

   Maddy implements the functionality to send and receive email over SMTP and store messages with IMAP access.

   5.9 APIOpenFree Free tier
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5. 13
   PM

   Pegasus Mailpmail.com

   Pegasus Mail is a free, standards-based email client for one or multiple users on a computer or local area network.

   6.0 APIOpenFree Free tier
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6. 19
   AJ

   Apache Jamesjames.apache.org

   Apache James is a modular mail server running on the JVM.

   5.9 APIOpenFree Free tier
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7. 12
   DM

   Docker Mailserverdocker-mailserver.github.io

   Docker Mailserver is a production-ready full-stack mail server providing SMTP, IMAP, LDAP, anti-spam and anti-virus in a container.

   6.0 APIOpenFree Free tier
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8. 20
   D

   Dovecotdovecot.org

   Dovecot Community Edition is an open-source email server.

   5.8 APIOpenFree Free tier
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9. 11
   M

   Modoboamodoboa.org

   Modoboa is an open-source platform for installing and managing a self-hosted email server.

   6.1 APIOpenFree Free tier · from €139/yr
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10. 21
    ME

    Microsoft Exchange Onlinemicrosoft.com

    Exchange Online is hosted email for business, with email, calendar, and contacts accessible across major browsers and devices.

    5.6 APIOpenFree —
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11. 10
    P

    Postfixpostfix.org

    Postfix aims to be fast, easy to administer, and secure.

    6.1 APIOpenFree Free tier
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12. 22
    G

    grommuniogrommunio.com
    5.6 APIOpenFree Free tier · from €1.99/mo
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13. 9
    MI

    Mail-in-a-Boxmailinabox.email

    Mail-in-a-Box turns a fresh cloud computer into a mail server that lets users run their own email service.

    6.1 APIOpenFree Free tier
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14. 23
    W

    Whitemailwhitemail.io
    5.1 APIOpenFree Free tier
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15. 8
    E

    Eximexim.org

    Exim is a mail transfer agent for hosts running Unix or Unix-like operating systems.

    6.2 APIOpenFree Free tier
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16. 24
    K

    KumoMTAkumomta.com
    5.1 APIOpenFree Free tier · from $5,000/yr
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17. 7
    M

    Mailumailu.io

    The project aims to provide an easily set up and maintained full-featured mail server without proprietary software or unrelated groupware features.

    6.2 APIOpenFree Free tier
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18. 25
    SM

    Synology MailPlus Serversynology.com
    5.1 APIOpenFree Free tier
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19. 6
    I

    iRedMailiredmail.org

    iRedMail is open-source software for deploying a full-featured mail server.

    6.2 APIOpenFree Free tier · from $10/yr
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20. 26
    SM

    Stalwart Mail ServerStalwart Labs
    5.0 APIOpenFree Free tier · from $2.40/yr
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