Alternatives to K-9 Mail for all platforms with any license

Thunderbird

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

Free Open Source Mac Windows Linux BSD PortableApps.com ... Haiku
Extensible by Plugins/Extensions Support for IMAP Built-in RSS reader Encryption ... SMTP integration Add-ons Calendar integration Extensions Multiple Account support Protected by Password Tabs Built-in Calendar Categories Customizable Delivery reports Desktop interface Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader Gui HTML Compose Integrated Chat Integrated Password Manager Integrated Web Browser Intuitive Legacy addons support Export to OPML Import feeds from OPML Organize mails POP3 Support Portable Secure File Sharing Support for POP3 Tabbed interface Support for Themes Add a feature

2015 Like
Microsoft Office Outlook

Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
- 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! Guest • May 2019 • 1 agrees and 2 disagrees
Freemium $ $ $ Mac Windows Web Android iPhone ... Android Tablet Windows Phone iPad Apple Watch Android Wear
Address book integration Built-in Calendar Calendar integration Exchange ... Box.com integration Contacts Custom rules Dropbox integration Email scheduling Exchange Integration Flight Status Gmail integration ICloud Integration Integrated Search Multiple Account support Night mode/Dark Theme Office 365 integration Onedrive integration Organize mails Shared calendars Signature with image Smart attachments Todos Unified inbox Yahoo Integration Add a feature

362 Like
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...

Freemium $ $ $ Mac Windows Linux Arch Linux Fedora ... Ubuntu
Unified inbox Multiple Account support Customizable Email tracking ... Night mode/Dark Theme Ad-free Auto update Beauty and fluid interface Built-in themes Linux Multi-platform support Notifications Sidebar Theme Customization Support for Themes User friendly Drag n drop Electron based Email Analytics Extensible by Plugins/Extensions Support for IMAP Snooze mail Threaded Conversations Add a feature

77 Like
Spark

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.

Freemium Mac Android iPhone
Clean design Multiple Account support Sync across Devices Calendar integration ... Email scheduling Exchange Organize mails Postpone email reception Smart inbox Snooze mail Add a feature

91 Like
Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration...

Free Open Source Windows Linux BSD
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Integrated Email Client Multiple languages Multiple Account support Add a feature

88 Like
Opera Mail

Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as...
- 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.
Free Mac Windows PortableApps.com
Built-in RSS reader Integrated Spam Protection Mail filtering Message Filtering ... Portable Add a feature

101 Like
Airmail

Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi Account with editable html...

Commercial $ $ $ Mac iPhone iPad Apple Watch
Clean design Support for IMAP Multiple Account support POP3 Support ... Customizable Dropbox integration Fullscreen support Lightweight Multiple Account support Add a feature

69 Like
FairEmail

FairEmail is a privacy-focused email client with a setup wizard that helpfully walks you through the steps to use it with any email provider. There are many privacy...

Freemium $ $ $ Open Source Android Android Tablet F-Droid
Calendar integration Privacy focused Security & Privacy Add a feature

24 Like
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BlueMail

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.

Free Personal $ $ $ Mac Windows Linux Android iPhone ... Chrome OS Android Tablet iPad Apple Watch
Ad-free Calendar integration Support for IMAP POP3 Support ... Unified inbox Add a feature

19 Like
Canary Mail

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. ...

Commercial $ $ $ Mac iPhone iPad Apple Watch
No features added Add a feature

12 Like

4.4 out of 5 with 8 ratings

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Alternatives to K-9 Mail for all platforms with any license

Thunderbird

Microsoft Office Outlook

Mailspring

Spark

Claws Mail

Opera Mail

Airmail

FairEmail

Know any more alternatives to K-9 Mail?

BlueMail

Canary Mail

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Tablet

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K-9 Mail Comments

Echo echo ... Feels empty in here