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FossaMail Alternatives

FossaMail is described as 'Open Source, Mozilla Thunderbird -based mail, news and chat client for Windows and Linux, brought to you by the Pale Moon developers' and is a Email Client in the office & productivity category. There are more than 10 alternatives to FossaMail for a variety of platforms, including Mac, Windows, Linux, iPhone and Android. The best alternative is Thunderbird, which is both free and Open Source. Other great apps like FossaMail are K-9 Mail, eM Client, Spark Mail and Mailbird.

FossaMail alternatives are mainly Email Clients but may also be Calendar Apps or Email Organizers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of FossaMail.
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  • FreeOpen Source
  • Windows
  • Linux

FossaMail is an Open Source, Mozilla Thunderbird -based mail, news and chat client for...

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  1. Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks. Moreover, 9 in 10 of our customers describe our interface as “intuitive” and beautiful.

    ⚫︎ Dark ModeMailbird supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailbird.
    ⚫︎ Multiple Account supportMailbird support multiple accounts without the need to logout and login
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    Screenshot
  2. Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

    ⚫︎ Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
    ⚫︎ Multiple Account supportThunderbird support multiple accounts without the need to logout and login
    ⚫︎ CustomizableThunderbird is easy to customize with themes or similar features.
    ⚫︎ Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
    ⚫︎ Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
    ⚫︎ PortableThunderbird can be used from a USB stick or similar with no prior installation.
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  3. K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable notifications and more.

    ⚫︎ Privacy focusedK-9 Mail is considered a privacy friendly alternative.
    ⚫︎ Multiple Account supportK-9 Mail support multiple accounts without the need to logout and login
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    Screenshot
  4. eM Client is a full featured email client with a clean and efficient user interface.

    ⚫︎ Multiple Account supporteM Client support multiple accounts without the need to logout and login
    ⚫︎ Dark ModeeM Client supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with eM Client.
    ⚫︎ Cloud SyncSync your data (notes, documents, bookmarks, etc.) across your different devices and to the cloud.
    ⚫︎ Sync with Google CalendareM Client can be synchronized with Google Calendar
    ⚫︎ Automatic BackupeM Client will automatically back up your data periodically.
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    eM Client: Inbox view
  5. E-mail app with all the great features: swipes (long/short), snooze, add (multiple) attachments from the cloud, support for various e-mail services and more.

    ⚫︎ Multiple Account supportSpark Mail support multiple accounts without the need to logout and login
    ⚫︎ Sync Across DevicesSpark Mail can sync your data across devices like your phone, desktop and tablet
    ⚫︎ Dark ModeSpark Mail supports dark mode for comfortable usage in low light conditions.
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    Screenshot


  6. Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks. Moreover, 9 in 10 of our customers describe our interface as “intuitive” and beautiful.

    ⚫︎ Dark ModeMailbird supports dark mode for comfortable usage in low light conditions.
    ⚫︎ Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailbird.
    ⚫︎ Multiple Account supportMailbird support multiple accounts without the need to logout and login
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    Screenshot
  7. Claws Mail is an email client (and news reader), based on GTK+, featuring

    Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility Robustness and stability.

    ⚫︎ LightweightClaws Mail consumes less device resources compared to similar apps.
    ⚫︎ Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
    ⚫︎ CustomizableClaws Mail is easy to customize with themes or similar features.
    ⚫︎ Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
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    The main window
  8. Postbox is an email application that helps you organize your work life and get stuff done.

    ⚫︎ Multiple Account supportPostbox support multiple accounts without the need to logout and login
    ⚫︎ Extensible by Plugins/ExtensionsPostbox can be extended with add-ons, plugins and extensions.
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    Screenshot
  9. Airmail icon

    Airmail

    • Mac
    • iPhone
    • iPad
    • Apple Watch

    Airmail is a lightweight and lightning fast mail client for Mac.

    ⚫︎ Multiple Account supportAirmail support multiple accounts without the need to logout and login
    ⚫︎ CustomizableAirmail is easy to customize with themes or similar features.
    ⚫︎ LightweightAirmail consumes less device resources compared to similar apps.
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    Screenshot
  10. Canary Mail icon

    Canary Mail

    • FreemiumProprietary
    • Mac
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Apple Watch

    Canary is an exciting new email client for Mac that offers a full set of powerful features with one key difference - your emails are not stored on a 3rd party server.

    ⚫︎ End-to-End EncryptionCanary Mail has E2E Encryption, for entire or parts of the app.
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    Screenshot
Showing 10 of 13 alternatives