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Open Source Mailbird Alternatives

The best open source alternative to Mailbird is Thunderbird. If that doesn't suit you, our users have ranked more than 50 alternatives to Mailbird and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Mailbird are Mailspring, Evolution, Claws Mail and Geary.

Mailbird 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 Mailbird.
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Mailbird iconMailbird
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Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows....

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  1. Thunderbird icon

    Thunderbird

    • Mac
    • Windows
    • Linux
    • Homebrew
    • PortableApps.com
    • Chocolatey
    • Flathub
    • AppImageHub
    • Snapcraft
    • BSD
    • Haiku
    96 alternatives to Thunderbird 

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

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    Features
    1.  Extensible by Plugins/ExtensionsThunderbird can be extended with add-ons, plugins and extensions.
    2.  Multiple Account supportThunderbird support multiple accounts without the need to logout and login
    3.  Calendar IntegrationThunderbird lets you sync your tasks and events with your calendar application.
    4.  Email OrganizerThunderbird allows you to take control of your inbox by filtering and control tools.
    5.  Dark ModeThunderbird supports dark mode for comfortable usage in low light conditions.
    6.  Support for ThemesYou can use themes and templates to change the look and feel of Thunderbird.
    7.  Integrated Password ManagerThunderbird lets you access all the passwords you’ve saved across your different devices.
    8.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
    9.  PortableThunderbird can be used from a USB stick or similar with no prior installation.
    Screenshot
    Dark Mode
    Mail Account Setup Wizard
    Thunderbird vs Mailbird opinions
    Some users think Thunderbird is a great alternative to Mailbird, some don't.
    Guest

    Thunderbird is way too bloated and slow

    Negative comment ago
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    10
    Guest

    It's open source & based on Firefox engine which is known for it's brand !!

    Positive comment ago
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    5
  2. Mailspring icon

    Mailspring

    • Mac
    • Windows
    • Linux
    • Arch Linux
    • Fedora
    • Ubuntu
    44 alternatives to Mailspring 

    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.

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    Features
    1.  Unified inboxView e-mails (or similar) from all accounts in one unified view with Mailspring.
    2.  Multiple Account supportMailspring support multiple accounts without the need to logout and login
    3.  Dark ModeMailspring supports dark mode for comfortable usage in low light conditions.
    4.  Ad-freeMailspring doesn't contain any form of external advertising.
    5.  Email OrganizerMailspring allows you to take control of your inbox by filtering and control tools.
    6.  Support for ThemesYou can use themes and templates to change the look and feel of Mailspring.
    7.  Extensible by Plugins/ExtensionsMailspring can be extended with add-ons, plugins and extensions.
    Clean design with integrated search and swipe gestures
    Built-in dark theme
    Advanced mailbox analytics
    Mailspring vs Mailbird opinions
    Some users think Mailspring is a great alternative to Mailbird, some don't.
    ithink

    Not possible to disable Gmail-style threading / conversation view

    Negative comment ago
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    0
    Guest

    Uses electron bloated framework that consumes many ram

    Negative comment ago
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    3


  3. Evolution icon

    Evolution

    • Linux
    • BSD
    • S/MIME
    • GNOME
    • OpenPGP
    80 alternatives to Evolution 

    Evolution is a personal information management application that provides integrated mail, calendaring, address book and task list functionality. Evolution supports a wide range of industry standard data formats and network protocols for information exchange, with an emphasis on...

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    Features
    1.  Calendar IntegrationEvolution lets you sync your tasks and events with your calendar application.
    2.  Calendar ViewEvolution has a built-in calendar view to have a clear overview of your content over time.
    3.  Multiple Account supportEvolution support multiple accounts without the need to logout and login
    4.  Sync with Google CalendarEvolution can be synchronized with Google Calendar
    5.  RemindersEvolution allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
    6.  GPG EncryptionEvolution supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
    7.  Spam FilterEvolution can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    Mail
    EMail Inbox
    Evolution vs Mailbird opinions
    Most users think Evolution is a great alternative to Mailbird.
  4. Claws Mail icon

    Claws Mail

    • Windows
    • Linux
    • BSD
    88 alternatives to Claws Mail 

    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.

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    Features
    1.  LightweightClaws Mail consumes less device resources compared to similar apps.
    2.  Extensible by Plugins/ExtensionsClaws Mail can be extended with add-ons, plugins and extensions.
    3.  Multiple Account supportClaws Mail support multiple accounts without the need to logout and login
    4.  No registration requiredYou can use most of the features in Claws Mail without registration.
    5.  Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Claws Mail.
    6.  Spam FilterClaws Mail can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    7.  PortableClaws Mail can be used from a USB stick or similar with no prior installation.
    The main window
    The account preferences window
  5. Geary icon

    Geary

    • Linux
    • BSD
    • GNOME
    • Flatpak
    52 alternatives to Geary 

    Geary is an email application built around conversations, for the GNOME 3 desktop.

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    Features
    1.  Multiple Account supportGeary support multiple accounts without the need to logout and login
    2.  Dark ModeGeary supports dark mode for comfortable usage in low light conditions.
    3.  Email OrganizerGeary allows you to take control of your inbox by filtering and control tools.
    4.  Spam FilterGeary can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
    5.  LightweightGeary consumes less device resources compared to similar apps.
    Main window
    Geary vs Mailbird opinions
    pros, cons and recent comments
    Guest

    Unusable for my needs. Can't discard groupment of letters into conversations and delete or move to folder only single letter, not conversation entirely. And it shows only last letters in each conversation, other letters become invisible.

    Negative comment ago
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    0


  6. Mutt icon

    Mutt

    • Mac
    • Windows
    • Linux
    • Xfce
    56 alternatives to Mutt 

    Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...

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    Features
    1.  PGP EncryptionMutt supports PGP, an encryption system used for sending encrypted emails and files.
    2.  Command line interfaceMutt either have CLI support or is a CLI-only app.
    Screenshot
  7. Betterbird icon

    Betterbird

    • Windows
    • Linux
    • Flathub
    27 alternatives to Betterbird 

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

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    This app doesn't have any features at the moment.
  8. Sylpheed icon

    Sylpheed

    • Mac
    • Windows
    • Linux
    • BSD
    • PortableApps.com
    47 alternatives to Sylpheed 

    Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).

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    Features
    1.  LightweightSylpheed consumes less device resources compared to similar apps.
    2.  PortableSylpheed can be used from a USB stick or similar with no prior installation.
    Main screen
    Composition window
  9. LucaMail icon

    LucaMail

    • Mac
    • Windows
    • Linux
    75 alternatives to LucaMail 

    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.

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    Features
    1.  Dark ModeLucaMail supports dark mode for comfortable usage in low light conditions.
    Screenshot
    Screenshot
  10. Kube icon

    Kube

    • Mac
    • Linux
    33 alternatives to Kube 

    Kube is a modern communication and collaboration client built with QtQuick on top of a high performance, low resource usage core. It provides online and offline access to all your mail, contacts, calendars, notes, todo's and more.

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    Features
    Screenshot
Showing 10 of 22 alternatives
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