Thunderbird Alternatives (January 2026)

Thunderbird

Thunderbird — Free Your Inbox. — Thunderbird

https://www.thunderbir.net/

Thunderbird is a free email application that’s easy to set up and customize - and it’s loaded with great features!

4/5

1,539+ reviews

Reviewed on:

G2
Capterra
Trustpilot
Trustradius
Producthunt
Getapp
Softwareadvice
Facebook
1.
Manage multiple accounts with the best email client 2024 | Mailbird
https://www.getmailbir
.com/

Email made easy and beautiful. Manage multiple accounts with the best email client for Windows 2024. Download the #1 email client program free Now.

2.
eM Client | The Best Email Client for Windows and Mac
https://emclien
.com/

Fast email client with full Gmail, Hotmail and other services synchronization. Best replacement for MS Outlook or Thunderbird. Free version for Home users.

3.
Mailspring - The best free email app
https://www.getmailsprin
.com/

Mailspring: The open-source, extensible email app for Mac, Linux, and Windows with open tracking, link click tracking, contacts enrichment data and more.

4.
Twobird
https://www.twobir
.com/

Discover your new all-purpose inbox. Write emails, create notes, set reminders and assign to-dos—your everyday tools, in Twobird.

5.
The Power Email App - Postbox
https://www.postbox-in
.com/

Postbox is the power email app for busy professionals, like you.

6.
Sylpheed - 軽快で使いやすいオープンソースのメールソフト
https://sylpheed.sraos
.jp/

Sylpheed - Sylpheed はシンプル、軽量かつ高機能で使いやすい、無料のメールソフトです。Sylpheed は Windows から Linux まで様々なプラットフォームに対応しています。

7.
K-9 Mail
https://k9mai
.app/

K-9 Mail is an open source email client focused on making it easy to chew through large volumes of email

8.
Spark Mail — Smart. Focused. Email.
https://sparkmailap
.com/

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest.

9.
Email Client Software - Everdesk The Best Email Client for Windows 7 and 8
https://www.everdes
.com/

EverDesk combines the best features of an Email Client, File Manager, Address Book and Calendar into one integrated interface, making it the most unique and comprehensive personal information manager on the market