Open Source Zoho Mail Alternatives

    The best open source alternative to Zoho Mail is ProtonMail, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 50 alternatives to Zoho Mail and 18 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Zoho Mail are Tutanota (Freemium, Open Source), Disroot (Free, Open Source), FairEmail (Freemium, Open Source) and Posteo (Paid, Open Source).

    This page was last updated Sep 21, 2021

    1. Secure email with absolutely no compromises, brought to you by MIT and CERN scientists. Swiss Based
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      ProtonMail vs Zoho Mail opinions
      Some users think ProtonMail is a great alternative to Zoho Mail, some don't.
      Free plan does not allow your own domain
      Negative comment almost 3 years ago

      7
      EtchyLitchi Encryption and secure service.
      Positive comment almost 2 years ago

      0
    2. Tutanota is a free and open source web-mail client that focuses on privacy and security. It has open source iOS and an Android apps.
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      Tutanota vs Zoho Mail opinions
      pros, cons and recent comments
      Its open source, so its bugs will always be minimal.
      Positive comment over 4 years ago

      -2
      Free plan does not allow your own domain
      Negative comment almost 2 years ago

      1


    3. Disroot is a platform that offers federated web services to the public. It combines free encrypted email with secure cloud services, including an online office suite. Services provided: * Email - Rainloop * Cloud -...
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    4. FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.
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    5. Web- and IMAP-based email service. 2GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.
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    6. CTemplar is a security and privacy focused email provider based in Iceland. They use E2EE (end to end encrypted encryption) to keep your conversations private and secure. Their service offers onion address for those who want the best possible privacy and security.
      No screenshots yet
      CTemplar vs Zoho Mail opinions
      pros, cons and recent comments
      imtilda Requires $8/mo subscription for custom domain
      Comment about 1 month ago

      0
      • FreeOpen Source
      • Online
      • Self-Hosted
      Horde Groupware is a free, enterprise ready, browser based collaboration suite. Users can manage and share calendars, contacts, tasks and notes with the standards compliant components from the Horde Project.
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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • Android
      • iPhone
      Finally, an email service that's built around your privacy. Get your @criptext.com email address and see what it's like to have peace of mind and privacy in every email you send.

      Discontinued

      Creator recently sent and email about going solo, but since then support has been unresponsive, as have nearly all new issues on github for a year now if not more...

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    7. Kolab Now provides a suite of intuitive apps in a user friendly environment to make your day to day online comms easier, smarter and most importantly; secure.
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    8. Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads. Teknik Mail is a premium feature available after a donation of $5 only
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    Showing 10 of 18 alternatives