K-9 Mail Alternatives for Linux

K-9 Mail is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best Linux 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 12 are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to K-9 Mail are Evolution, Mailspring, Claws Mail and Delta Chat.

K-9 Mail alternatives are mainly Email Clients but may also be Calendar Apps or WebMail Providers. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of K-9 Mail.

K-9 Mail alternatives page was last updated

K-9 Mail

304

Free • Open Source
Email Client

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

More about K-9 Mail

Thunderbird
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Calendar App
Mac
Windows
Linux
BSD
AppImageHub
Snapcraft
Flathub
PortableApps.com
Haiku
Homebrew
Chocolatey
95 Thunderbird alternatives
Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.
- - Thunderbird is the most popular Windows, Mac & Linux alternative to K-9 Mail.
- - Thunderbird is the most popular Open Source & free alternative to K-9 Mail.
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Thunderbird 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. OpenPGPThunderbird supports OpenPGP, a standard of PGP encryption that is open-source for public use.
7. GPG EncryptionThunderbird supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
8. PortableThunderbird can be used from a USB stick or similar with no prior installation.
9. Import/Export OPML FeedsImport and export your feed subscriptions into OPML format with Thunderbird.
IMAP Support
SMTP Support
FOSS
Add-ons
Built-in RSS reader
POP3 Support
Graphical User Interface
Intuitive
Integrated Web Browser
Customizable
Opinions about Thunderbird as a Alternative to K-9 Mail
Most users think Thunderbird is a great K-9 Mail alternative.
Evolution
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Calendar App
Linux
BSD
Flathub
S/MIME
GNOME
OpenPGP
83 Evolution alternatives
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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Evolution 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. Ad-freeEvolution doesn't contain any form of external advertising.
4. Multiple Account supportEvolution support multiple accounts without the need to logout and login
5. GPG EncryptionEvolution supports GPG (aka GnuPG) for encryption of things like emails, messages, files, etc.
6. Spam FilterEvolution can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
7. RemindersEvolution allows you to set reminders for tasks, events or actions, based on parameters of time, place or condition.
8. Sync with Google CalendarEvolution can be synchronized with Google Calendar
Contacts
CalDAV Support
Encrypted Email
CardDAV Support
Personal Information Manager (PIM)
IMAP Support
Exchange
POP3 Support
Multiple languages
Integrated Spam Protection
Mailspring
Is this is a good alternative?
Yes
No
Freemium • Open Source
Email Client
Mac
Windows
Linux
Arch Linux
Fedora
Ubuntu
46 Mailspring alternatives
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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Mailspring 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. Support for ThemesYou can use themes and templates to change the look and feel of Mailspring.
5. Ad-freeMailspring doesn't contain any form of external advertising.
6. Email OrganizerMailspring allows you to take control of your inbox by filtering and control tools.
7. Extensible by Plugins/ExtensionsMailspring can be extended with add-ons, plugins and extensions.
Customizable
Email tracking
User friendly
Snooze Mail
Built-in translation
Built-in themes
Auto Update
Notifications
Sidebar
Theme Customization
Claws Mail
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Calendar App
Windows
Linux
BSD
84 Claws Mail alternatives
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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Claws Mail 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. Spam FilterClaws Mail can detect unsolicited, unwanted and virus-infected emails, calls, files, etc.
6. Privacy focusedClaws Mail is considered a privacy friendly alternative.
7. Works OfflineClaws Mail can be used without the need to connect to the internet.
8. Calendar IntegrationClaws Mail lets you sync your tasks and events with your calendar application.
9. PortableClaws Mail can be used from a USB stick or similar with no prior installation.
IMAP Support
Customizable
Ad-free
GPG Encryption
Import/Export OPML Feeds
End-to-End Encryption
Built-in RSS reader
Integrated Email Client
Multiple languages
Content Filtering
Opinions about Claws Mail as a Alternative to K-9 Mail
Almost everyone thinks Claws Mail is a great K-9 Mail alternative.
Delta Chat
Is this is a good alternative?
Yes
No
Free • Open Source
Encrypted Chat App
Instant Messenger
Group Chat App
Mac
Windows
Linux
Android
iPhone
Android Tablet
Flathub
F-Droid
Snapcraft
60 Delta Chat alternatives
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.
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Delta Chat Features
1. DecentralizedDelta Chat is based on a decentralized infrastructure with no single entity controlling it.
Encrypted Email
IMAP Support
Multiple languages
Electron based
Betterbird
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Windows
Linux
Flathub
30 Betterbird alternatives
Betterbird is a fine-tuned version of Mozilla Thunderbird, Thunderbird on steroids, if you will.
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Betterbird Features
1. Privacy focusedBetterbird is considered a privacy friendly alternative.
2. Multiple Account supportBetterbird support multiple accounts without the need to logout and login
3. Unified inboxView e-mails (or similar) from all accounts in one unified view with Betterbird.
4. Extensible by Plugins/ExtensionsBetterbird can be extended with add-ons, plugins and extensions.
5. Works OfflineBetterbird can be used without the need to connect to the internet.
6. Calendar IntegrationBetterbird lets you sync your tasks and events with your calendar application.
7. PGP EncryptionBetterbird supports PGP, an encryption system used for sending encrypted emails and files.
8. No TrackingBetterbird will not track you or use your personal data.
9. Ad-freeBetterbird doesn't contain any form of external advertising.
Personal Information Manager (PIM)
Built-in RSS reader
Lightweight
FOSS
Support for Themes
Add a screenshot
BlueMail
Is this is a good alternative?
Yes
No
Free Personal • Proprietary
Email Client
Mac
Windows
Linux
Android
iPhone
Chrome OS
Android Tablet
iPad
Apple Watch
27 BlueMail alternatives
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.
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BlueMail Features
1. Unified inboxView e-mails (or similar) from all accounts in one unified view with BlueMail.
2. Ad-freeBlueMail doesn't contain any form of external advertising.
3. LightweightBlueMail consumes less device resources compared to similar apps.
4. Multiple Account supportBlueMail support multiple accounts without the need to logout and login
5. Calendar IntegrationBlueMail lets you sync your tasks and events with your calendar application.
IMAP Support
GDPR Compliant
POP3 Support
Opinions about BlueMail as a Alternative to K-9 Mail
Some users think BlueMail is a great K-9 Mail alternative, some don't.
LucaMail
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
76 LucaMail alternatives
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.
Suggest and vote on features
LucaMail Features
1. Dark ModeLucaMail supports dark mode for comfortable usage in low light conditions.
IMAP Support
Discontinued
Repository marked as archived as of Dec 24, 2022. No new releases since May 26, 2022.
Kube
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Mac
Linux
33 Kube alternatives
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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Kube Features
KDE
TypeApp
Is this is a good alternative?
Yes
No
Free Personal • Proprietary
Email Client
Mac
Windows
Linux
Android
iPhone
Android Tablet
iPad
Android Wear
Kindle Fire
60 TypeApp alternatives
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.
Suggest and vote on features
TypeApp Features
1. Unified inboxView e-mails (or similar) from all accounts in one unified view with TypeApp.
2. Email OrganizerTypeApp allows you to take control of your inbox by filtering and control tools.
3. Privacy focusedTypeApp is considered a privacy friendly alternative.
4. Multiple Account supportTypeApp support multiple accounts without the need to logout and login
Live Push Notifications
Exchange
Columba
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
BSD
60 Columba alternatives
Columba is an email client written in Java, featuring a user-friendly graphical interface with wizards and internalionalization support. Its a powerful mail management tool with features to enhance your productivity and communication.
Columba has no features, suggest some!
Discontinued
The project is no longer developed. Last version, 1.4, released in March 2007, can be still downloaded from SourceForge.
Nylas Mail Lives
Is this is a good alternative?
Yes
No
Free • Open Source
Email Client
Mac
Windows
Linux
Self-Hosted
33 Nylas Mail Lives alternatives
Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to publish new releases.
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Nylas Mail Lives Features
1. Extensible by Plugins/ExtensionsNylas Mail Lives can be extended with add-ons, plugins and extensions.
2. Multiple Account supportNylas Mail Lives support multiple accounts without the need to logout and login
Discontinued
On its github page it states it is archived and is no longer maintained.