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Open Source Zoho Mail Alternatives

The best open source alternative to Zoho Mail is Proton Mail. If that doesn't suit you, our users have ranked more than 50 alternatives to Zoho Mail and 19 is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Zoho Mail are Tutanota, Disroot, FairEmail and Posteo.

Zoho Mail alternatives are mainly WebMail Providers but may also be Email Clients or Calendar Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Zoho Mail.
This page was last updated
Zoho Mail iconZoho Mail
  107
  • Mac
  • Windows
  • Linux
  • Online
  • Android
  • iPhone

Zoho Mail is an integrated email suite for modern enterprises, complete with Calendar, Notes, Tasks, Contacts, and...

Learn more about Zoho Mail

  1. Proton Mail icon

    Proton Mail

    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    81 alternatives to Proton Mail 

    Secure email with absolutely no compromises, brought to you by MIT and CERN scientists.

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    Features
    1.  End-to-End EncryptionProton Mail has E2E Encryption, for entire or parts of the app.
    2.  Privacy focusedProton Mail is considered a privacy friendly alternative.
    3.  Two-factor AuthenticationProton Mail supports two-factor authentication (2FA).
    4.  Ad-freeProton Mail doesn't contain any form of external advertising.
    5.  PGP EncryptionProton Mail supports PGP, an encryption system used for sending encrypted emails and files.
    6.  Self Destructing MessagesProton Mail supports the use of private messages that will be auto deleted according to a specified time or action.
    7.  No TrackingProton Mail will not track you or use your personal data.
    8.  Dark ModeProton Mail supports dark mode for comfortable usage in low light conditions.
    9.  Support for AliasesProton Mail supports aliases, so you can receive email without exposing your main email address
    Screenshot
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    Proton Mail vs Zoho Mail opinions
    Some users think Proton Mail is a great alternative to Zoho Mail, some don't.
    EtchyLitchi

    Encryption and secure service.

    Positive comment ago
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    0
    Guest

    Free plan does not allow your own domain

    Negative comment ago
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    9
  2. Tutanota icon

    Tutanota

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Self-Hosted
    • F-Droid
    75 alternatives to Tutanota 

    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. The Android app is published on F-Droid (which means the app does not use Google's push notification system) making it a great option if you...

     Suggest and vote on features
    Features
    1.  Privacy focusedTutanota is considered a privacy friendly alternative.
    2.  End-to-End EncryptionTutanota has E2E Encryption, for entire or parts of the app.
    3.  Dark ModeTutanota supports dark mode for comfortable usage in low light conditions.
    4.  Multiple Account supportTutanota support multiple accounts without the need to logout and login
    5.  LightweightTutanota consumes less device resources compared to similar apps.
    6.  Support for AliasesTutanota supports aliases, so you can receive email without exposing your main email address
    7.  PGP EncryptionTutanota supports PGP, an encryption system used for sending encrypted emails and files.
    Screenshot
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    Tutanota vs Zoho Mail opinions
    pros, cons and recent comments
    Guest

    Its open source, so its bugs will always be minimal.

    Positive comment ago
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    -2
    Guest

    Free plan does not allow your own domain

    Negative comment ago
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    2


  3. Disroot icon

    Disroot

    22 alternatives to Disroot 

    Disroot is a platform providing online services based on principles of freedom, privacy, federation and decentralization.

     Suggest and vote on features
    Features
    1.  Privacy focusedDisroot is considered a privacy friendly alternative.
    2.  DecentralizedDisroot is based on a decentralized infrastructure with no single entity controlling it.
    3.  Ad-freeDisroot doesn't contain any form of external advertising.
    4.  End-to-End EncryptionDisroot has E2E Encryption, for entire or parts of the app.
    5.  Support for AliasesDisroot supports aliases, so you can receive email without exposing your main email address
    Screenshot
    Rainloop, with the AlternativeTo  email confirmation open
  4. FairEmail icon

    FairEmail

    • Android
    • Android Tablet
    • F-Droid
    43 alternatives to FairEmail 

    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.

     Suggest and vote on features
    Features
    1.  Privacy focusedFairEmail is considered a privacy friendly alternative.
    2.  Multiple Account supportFairEmail support multiple accounts without the need to logout and login
    3.  PGP EncryptionFairEmail supports PGP, an encryption system used for sending encrypted emails and files.
    4.  Block TrackersFairEmail has a feature to block trackers from tracking you.
    5.  Calendar IntegrationFairEmail lets you sync your tasks and events with your calendar application.
    Compose message view.
    Setup screen.
  5. Posteo icon

    Posteo

    58 alternatives to Posteo 

    Web- and IMAP-based email service. 2GB cost 1€/month. Information is hosted on encrypted hard drives. Electricity from renewable resources is used.

     Suggest and vote on features
    Features
    1.  Privacy focusedPosteo is considered a privacy friendly alternative.
    2.  Calendar IntegrationPosteo lets you sync your tasks and events with your calendar application.
    3.  PGP EncryptionPosteo supports PGP, an encryption system used for sending encrypted emails and files.
    4.  Support for AliasesPosteo supports aliases, so you can receive email without exposing your main email address
    Main Website
    Screenshot of mail page from site Features page: https://posteo.de/en/site/features


  6. Horde icon

    Horde

    • Online
    • Self-Hosted
    40 alternatives to Horde 

    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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    Features
    Discontinued

    The last release (5.2.22) was in September 2017.

    Screenshot
  7. Kolab Now icon

    Kolab Now

    • Online
    • Software as a Service (SaaS)
    • DAVdroid
    74 alternatives to Kolab Now 

    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.

     Suggest and vote on features
    Features
    1.  Support for AliasesKolab Now supports aliases, so you can receive email without exposing your main email address
    2.  Real time collaborationMultiple users can work together in Kolab Now simultaneously.
    Kolab Now email
    Kolab Now calendar
  8. Criptext icon

    Criptext

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    19 alternatives to Criptext 

    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.

     Suggest and vote on features
    Features
    1.  Privacy focusedCriptext is considered a privacy friendly alternative.
    2.  Support for AliasesCriptext supports aliases, so you can receive email without exposing your main email address
      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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    • Swisscows.email icon

      Swisscows.email

      50 alternatives to Swisscows.email 

      Swisscows.email is another product of Swisscows AG. This product offers you secure email traffic. With Swisscows.email you can send your emails encrypted so that absolutely no one can read them. The service is comparable to a letter that is protected from prying eyes in an...

       Suggest and vote on features
      Features
      Screenshot
    • Teknik Mail icon

      Teknik Mail

      • Online
      72 alternatives to Teknik Mail 

      Teknik was created to provide users with web services that they can trust. Services range from url shorteners to pastebins and encrypted file uploads.

       Suggest and vote on features
      Features
    Showing 10 of 19 alternatives
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