SeaMonkey AlternativesOnly apps categorised as Email Clients

The best Email Client alternative to SeaMonkey is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to SeaMonkey and ten of them are Email Clients so hopefully you can find a suitable replacement. Other interesting Email Client alternatives to SeaMonkey are Vivaldi, Wino Mail, Iceape-UXP and Flectar Mail.

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SeaMonkey alternatives are mainly Email Clients, but if you're looking for Contact Managers or Web Browsers you can filter on that. Other popular filters include Android. These are just examples - use the filter bar below to find more specific alternatives to SeaMonkey.
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Alternatives
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Alternatives list

  1. Thunderbird icon

    Thunderbird

     2624 likes

    Cross-platform email client supporting multiple identities, chat, and strong filtering. Extend functionality with add-ons like RSS/Atom feed readers and PGP support.

    99 Thunderbird alternatives

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • BSD
    • AppImageHub
    • Snapcraft
    • Flathub
    • PortableApps.com
    • F-Droid
    • Haiku
    • Homebrew
    • Chocolatey
    • OpenAPK
    • US flagUnited States
    Thunderbird screenshot 1
    Good alternative?
     
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    3
  2. Vivaldi icon

    Vivaldi

     1317 likes

    Flexible browser featuring deep customization, integrated ad and tracker blocking, Chromium compatibility, powerful tab management tools, note sync, screenshot utility, custom web panels, theme and toolbar editing, plus support for Android, iOS, desktop, and privacy protections.

    199 Vivaldi alternatives

    Cost / License

    • Free
    • Proprietary

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • HUAWEI AppGallery
    • iPad
    • Snapcraft
    • Android Auto
    • Flathub
    • Samsung Galaxy Store
    • Debian
    • Fedora
    • Ubuntu
    • openSUSE
    • NO flagNorway
    Vivaldi screenshot 1
    Good alternative?
     
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    3
  4. Wino Mail icon

    Wino Mail

     8 likes

    Wino is a lightweight native mail client for Windows 10/11. It is still in active development. Main motivation for this project is to replace Mail & Calendar for Windows with modern Windows design without using web technologies for speed.

    Cost / License

    Application type

    Platforms

    • Windows
    • TR flagTürkiye
    Wino Mail screenshot 1
    Good alternative?
     
  5. Iceape-UXP icon

    Iceape-UXP

     Like

    Historically, Iceape was a re-branding of SeaMonkey by the Debian project. However, Debian discontinued Iceape in December 2013 citing security concerns and lack of a maintainer.

    125 Iceape-UXP alternatives

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    Good alternative?
     
  6. Flectar Mail icon

    Flectar Mail

     3 likes

    Built from the ground up for speed. Flectar Mail delivers native performance, instant startup, and as little as 20 MB of RAM.

    Cost / License

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • ES flagSpain
    • European Union flagEU
    Flectar Mail screenshot 1
    Good alternative?
     
  8. Eclipse Mail icon

    Eclipse Mail

     1 like

    Eclipse Mail is a fork of Interlink Mail and News made for Windows XP and runs on IA-32 i686 platforms. Some advantages over upstream and roytam1's mailnews are more optimizations and better interoperability with upstream.

    Cost / License

    Application type

    Platforms

    • Windows
    Eclipse Mail screenshot 1
    Good alternative?
     
  9. Icedove-UXP icon

    Icedove-UXP

     Like

    Historically, Icedove was a re-branding of Thunderbird by the Debian project, with minimal modifications, in order to resolve branding disputes. Debian since discontinued Iceweasel in February of 2017 after reaching an agreement with Mozilla over the use of it's trademark.

    Cost / License

    • Free
    • Open Source

    Application type

    Platforms

    • Linux
    Good alternative?
     
  10. Vireo Mail icon

    Vireo Mail

     Like

    Vireo is a clean, fast, GNOME-native email client with a calm three-pane layout, unified inbox, and support for OAuth accounts. Fast to open, effortless to read, and private by default.

    Cost / License

    Application type

    Platforms

    • Linux
    • Flatpak
    • US flagUnited States
    Vireo Mail screenshot 1
    Good alternative?
     
  11. TouchMail icon

    TouchMail

     Like

    Navigate messages with zooms and swipes across your messages.

    Turn your email into colorful, visual tiles you can explore with your fingers or mouse. Rich 3D visualizations and familiar gestures make TouchMail the fastest and easiest way to keep your inbox clean and keep import.

    66 TouchMail alternatives

    Cost / License

    • Paid
    • Proprietary

    Application type

    Platforms

    • Windows
    • US flagUnited States
    Visual mail
    Good alternative?
     
  12. Clyton icon

    Clyton

     1 like

    Clyton is an email client with advanced security and spam filtering features. Although priced for the general public, Clyton possesses the reliability and security required by businesses.

    Cost / License

    • Freemium
    • Proprietary

    Application type

    Platforms

    • Windows
    • US flagUnited States
    Clyton screenshot 1
    Good alternative?
     
10 of 10 SeaMonkey alternatives