Zoho Mail AlternativesOnly Open Source apps categorised as WebMail Providers

The best open source WebMail Provider alternative to Zoho Mail is Proton Mail. If that doesn't suit you, our users have ranked more than 100 alternatives to Zoho Mail and 18 are open source WebMail Providers so hopefully you can find a suitable replacement. Other interesting open source WebMail Provider alternatives to Zoho Mail are Tuta Mail, Disroot, Posteo and Infomaniak kMail.

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Alternatives list

  1. Proton Mail icon

    Proton Mail

     1017 likes
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    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any device.

    98 Proton Mail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Tor
    • Flathub
    • Snapcraft
    Proton Mail screenshot 1
     
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    12
    Comments about Proton Mail as an Alternative to Zoho Mail
    Guest
    Negative
    11

    Free plan does not allow your own domain

    Review by a new / low-activity user.
    Serely Lalla
    Positive
    -1

    Encryption and secure service.

    Zoho Mail Icon
    Proton Mail icon

    • Most users think Proton Mail is a great Zoho Mail alternative.

    • Proton Mail is the most popular Web-based, Windows, Android & Mac alternative to Zoho Mail.

    • Proton Mail is the most popular Open Source & free alternative to Zoho Mail.

    • Proton Mail is Freemium and Open SourceZoho Mail is Freemium and Proprietary
  2. Tuta Mail icon

    Tuta Mail

     516 likes
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    Offers comprehensive encryption for email, calendar, and contacts with zero personal info required. Built on open source, install via Play Store, F-Droid, or APK, with Tor and VPN support. Both free and paid plans; utilizes quantum-resistant encryption ensuring privacy-focused, anonymous usage.

    103 Tuta Mail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Android
    • iPhone
    • iPad
    • Flathub
    • F-Droid
    Tuta Mail screenshot 1
     
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    2
    6
    Comments about Tuta Mail as an Alternative to Zoho Mail
    Guest
    Negative
    3

    Free plan does not allow your own domain

    Review by a new / low-activity user.
    Guest
    Positive
    -1

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

    Review by a new / low-activity user.
    Zoho Mail Icon
    Tuta Mail icon

    • Most users think Tuta Mail is a great Zoho Mail alternative.

    • Tuta Mail is Freemium and Open SourceZoho Mail is Freemium and Proprietary
    • Tuta Mail is LightweightZoho Mail is not according to our users
  4. Disroot icon

    Disroot

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

    44 Disroot alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • F-Droid
    Disroot screenshot 1
     
  5. Ad
    Screenshot
    Proton Mail icon
    Proton Mail

    Proton Mail provides secure email services with end-to-end encryption, ensuring data protection. Swiss-based and outside US jurisdiction, it offers a free version to champion privacy as a human right. Fully accessible on any devi...

    https://proton.me
    Learn More
  6. Posteo icon

    Posteo

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

    74 Posteo alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    Drag and drop
     
  7. Infomaniak kMail icon

    Infomaniak kMail

     38 likes
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    Privacy-focused Swiss email system provides 20 GB free storage, supports custom domains and unlimited storage, syncs contacts and calendars, is ad-free, and is part of a secure productivity suite used by over a million users across Europe on all devices.

    42 Infomaniak kMail alternatives

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application types

    Platforms

    • Online
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • F-Droid
    Infomaniak kMail screenshot 1
     
  8. Kolab Now icon

    Kolab Now

     42 likes
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    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.

    78 Kolab Now alternatives

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    • DAVx5
    Kolab Now email
     
  10. Horde icon

    Horde

     29 likes
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    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.

    Cost / License

    • Free
    • Open Source

    Application type

    Alerts

    • Discontinued

    Platforms

    • Online
    • Self-Hosted
    Horde screenshot 1
     

    • Horde is the most popular Self-Hosted alternative to Zoho Mail.

    • Horde is Free and Open SourceZoho Mail is Freemium and Proprietary
  11. Swisscows.email icon

    Swisscows.email

     5 likes
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    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...

    Cost / License

    • Subscription
    • Open Source

    Application types

    Platforms

    • Online
    • iPhone
    • iPad
    • Android
    • Android Tablet
    Swisscows.email screenshot 1
     
  12. AfterLogic Aurora icon

    AfterLogic Aurora

     Like
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    Afterlogic Aurora is an enterprise collaboration system for small and medium-sized business. Aurora provides collaboration of webmail, contacts, calendar, files and helpdesk modules.

    Cost / License

    • Pay once
    • Open Source

    Application types

    Platforms

    • Windows
    • Online
    • Android
    • iPhone
    • Self-Hosted
    AfterLogic Aurora screenshot 1
     
  13. Forward Email icon

    Forward Email

     6 likes
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    Forward Email is the best email service, encrypted email service, and fastest email service. It supports unlimited domains and aliases for no extra cost. It uses quantum safe ChaCha20-Poly1305 encryption and offers SMTP, IMAP, POP3, email webhooks, email regular expressions...

    Cost / License

    • Freemium (Subscription)
    • Open Source

    Application type

    Platforms

    • Self-Hosted
    • Online
    Forward Email screenshot 1
     
  14. Onion Mail icon

    Onion Mail

     4 likes
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    The power of simplicity. Onion Mail can manage emails in the normal network and in the Tor. Onion Mail protect your privacy and anonymity.

    31 Onion Mail alternatives

    Cost / License

    • Freemium
    • Open Source

    Application types

    Platforms

    • Online
    • Android
     
  15. Zero Email icon

    Zero Email

     4 likes
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    Zero is an open-source AI email solution that gives users the power to self-host their own email app while also integrating external services like Gmail and other email providers. Our goal is to modernize and improve emails through AI agents to truly modernize emails.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Online
    • Self-Hosted
    • Docker
    Zero Email screenshot 1
     
12 of 18 Zoho Mail alternatives