Alternatives to K-9 Mail for Windows 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
Support for IMAP Extensible by Plugins/Extensions SMTP integration Built-in RSS reader ... Multiple Account support Add-ons Calendar integration Encryption Extensions Plugins Desktop interface Gui Integrated Web Browser Intuitive Night mode/Dark Theme Protected by Password Support for POP3 Tabs Built-in Calendar Categories Customizable Delivery reports Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader HTML Compose Integrated Chat Integrated Password Manager Legacy addons support Export to OPML Import feeds from OPML Organize mails POP3 Support Portable Secure File Sharing Tabbed interface Support for Themes Add a feature

2045 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 • 3 agrees and 2 disagrees
Commercial $ $ $ Mac Windows Web Android iPhone ... Android Tablet Windows Phone iPad Apple Watch Android Wear
Address book integration Built-in Calendar Calendar integration Custom rules ... Exchange Native application Onenote Desktop Integration Box.com integration Contacts 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

363 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 Notifications Sidebar Snooze mail Theme Customization Support for Themes User friendly Drag n drop Electron based Email Analytics Extensible by Plugins/Extensions Support for IMAP Threaded Conversations Add a feature

77 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
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
GDPR compliant Unified inbox Ad-free Calendar integration ... Support for IMAP POP3 Support Add a feature

19 Like
Juicy Mail

A whole new way of using email. Reimagined for the modern age, it transforms the way you communicate, share media, interact with notifications, manage your inbox, stay...

Free Mac Windows Web Android
Email deliverability Support for IMAP Inbox messaging Add a feature

5 Like
Hiri

Fast, good looking email client. Lighter than MS Outlook with some unique and clever features. Works ONLY with Outlook / Exchange.
- Discontinued
  According to Wikipedia it hasn't been updated since 2018. People are also complaining about the lack of response from the team. https://en.wikipedia.org/wiki/Hiri_(email_client)
Commercial $ $ $ Mac Windows Linux
Office 365 integration Calendar integration Convert Email to Task Todos Add a feature

32 Like
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Nylas Mail Lives

Nylas Mail Lives is a fork of Nylas Mail that fixes many longstanding issues, improves the client experience, and is committed to...
- Discontinued
  On its github page it states it is archived and is no longer maintained.
Free Open Source Mac Windows Linux Self-Hosted
Extensible by Plugins/Extensions Multiple Account support Add a feature

3 Like
Koma-Mail

Koma-Mail is an email client which is comfortable and has very handy functions. It does not need an installation, so that you can run Koma-Mail from your flash drive...
- Discontinued
  Development of KOMA Code apps stopped in January 2017. Last version of Koma-Mail, 3.83, released in March 2012, can be still downloaded from the official website.
Free Windows
Built-in RSS reader Multiple languages Multiple Account support POP3 Support ... Portable Support for Unicode Add a feature

4 Like

Active filters: windows, clear and show all alternatives

K-9 Mail

Alternatives to K-9 Mail for Windows with any license

Thunderbird

Microsoft Office Outlook

Mailspring

Claws Mail

Opera Mail

BlueMail

Juicy Mail

Hiri

Know any more alternatives to K-9 Mail?

Nylas Mail Lives

Koma-Mail

Platforms

Desktop

Mobile

Tablet

License