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K-9 Mail Alternatives for Windows

K-9 Mail is not available for Windows but there are plenty of alternatives that runs on Windows with similar functionality. The best Windows alternative is Thunderbird, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to K-9 Mail and 16 are available for Windows so hopefully you can find a suitable replacement. Other interesting Windows alternatives to K-9 Mail are Microsoft Office Outlook, Mailspring, Delta Chat and Claws Mail.

K-9 Mail alternatives are mainly Email Clients but may also be Calendar Apps or Group Chat Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of K-9 Mail.
This page was last updated Apr 15, 2022
K-9 Mail
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  • FreeOpen Source
  • Android
  • Android Tablet
  • F-Droid

K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address...

Learn more about K-9 Mail

  1. Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

    Most users think Thunderbird is a great alternative to K-9 Mail.
  2. Microsoft Outlook, part of the Microsoft Office Suite (not to be confused with Microsoft Outlook Express), is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

    Microsoft Office Outlook vs K-9 Mail opinions
    This alternative is disputed. Microsoft Office Outlook is still a legitimate alternative to K-9 Mail, but it might have issues that some users think are important.

    Microsoft Office Outlook has more vulnerabilities and so far, seems more of a memory hogger on my device than K-9 Mail. Thank you, K-9 Mail!

    Negative comment about 3 years ago
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    If this Comment contains spam or other abuse, notify admins about it.

    3


  3. Boost your productivity and send better email with Mailspring, a beautiful, fast email client for Mac, Windows, and Linux. Mailspring is free to use and an optional pro version adds read receipts, send later, reminders and more.

  4. Delta Chat

    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • FLATHUB
    • F-Droid

    Delta Chat looks and feels like other popular messenger apps, but does not involve centralized control, tracking or selling you, friends, colleagues or family out to large organizations. "Privacy by Design" has never been more fun.

  5. 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.


  6. BlueMail

    • Free PersonalProprietary
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Chrome OS
    • Android Tablet
    • iPad
    • Apple Watch

    BlueMail is a modern, mobile first, powerful Email management tool with a sleek design, unified inbox and support for all your accounts: IMAP,Exchange,POP3.

    Some users think BlueMail is a great alternative to K-9 Mail, some don't.
  7. Opera Mail

    • FreeProprietary
    • Mac
    • Windows
    • PortableApps.com

    Opera Mail powerfully organizes, indexes, and sorts your messages.

    Discontinued

    Opera Mail is no longer updated and supported, but last version, 1.0.1044, released in February 2016, can be still downloaded from the official website.

  8. Betterbird

    • FreeOpen Source
    • Windows
    • Linux

    Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will.

    No screenshots yet
  9. TypeApp

    • Free PersonalProprietary
    • Mac
    • Windows
    • Linux
    • Android
    • iPhone
    • Android Tablet
    • iPad
    • Android Wear
    • Kindle Fire

    TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email accounts.

  10. LucaMail

    • FreeOpen Source
    • Mac
    • Windows
    • Linux

    LucaMail is an open source, cross-platform email client. LucaMail is developed to provide cross-platform alternative to Email Clients that are really exists. LucaMail focuses on modern technologies as well as maintaining a user-friendly UI.

Showing 10 of 16 alternatives