Thunderbird Alternatives & Reviews


Thunderbird is a free, open source e-mail client from Mozilla, the makers of the popular web browser Firefox. It comes with a number of powerful features to manage your e-mail accounts and messages.
Rating (4.00)
macOS Unix Web

23 Best Alternatives to Thunderbird

Mailbird icon


Email made easy and beautiful. Manage multiple accounts with the best email client for Windows. Download the #1 mail client program free Now.‎Features - ‎Why Choose Mailbird?
ProtonMail icon


ProtonMail is one of the best encrypted email platforms on the market, and the encryption is more than powerful enough to protect your most sensitive email communications.
eM Client icon

eM Client

With eM Client, you'll be able to bring together all your most important tasks, calendars, instant messages, and emails into a single sleek app. Since the software is designed to easily integrate with your existing workflow, it produces little change in your daily life beyond making it simpler.
Opera Mail icon

Opera Mail

Opera is a secure, innovative browser used by millions around the world with a built-in ad blocker, free VPN, units converter, social messengers, battery saver and much more - all for your best browsing experience.
Apple Mail icon

Apple Mail

macOS Mojave brings new features inspired by its most powerful users, but designed for everyone to the Mac.
K-9 Mail icon

K-9 Mail

K-9 Mail – Advanced Email for Android 📧. Contribute to k9mail/k-9 development by creating an account on GitHub.
Evolution icon


Evolution is the official personal information manager for the GNOME Project, serving as a robust scheduling and management tool for individuals using a wide range of Linux distributions.
Postbox icon


Postbox is an email client that combines all of your email accounts into one program for use on your Mac or PC desktop. The software gives you access to both IMAP and POP email accounts, along with your RSS feeds.
Sylpheed icon


Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client. Sylpheed provides intuitive user-interface. Sylpheed is also designed for keyboard-oriented operation, so Sylpheed can be widely used from beginners to power users.
Isotope Mail Client icon

Isotope Mail Client

Isotope mail client is a free open source webmail application built with a microservice architecture vision in mind. As of now, the application is just an MVP offering the basic functionalities of any standard webmail client.
Airmail icon


Airmail - Lightning Fast Mail Client for Mac and iPhone.
Zoho Mail icon

Zoho Mail

Zoho Mail is an app that is convenient so that you can check your messages while you're on the go or when you don't want to log in on another device.
Mailspring icon


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


Shift is a desktop app for streamlining all of your email and app accounts. Easily manage Gmail and Google Drive | Messenger, WhatsApp, Slack, and 500+ apps.
Front icon


Front is a collaborative email platform that allows a team of professionals to work together in the same digital communication system no matter where they are in the physical world.
Sanebox icon


Sanebox is a software program that is designed to clean up and reprioritize your email inbox. What Sanebox ends up doing is usually a complete overhaul of your email system.
Amazon WorkMail icon

Amazon WorkMail

Amazon WorkMail is a secure, managed business email and calendar service with support for existing desktop and mobile email client applications. Amazon WorkMail gives users the ability to seamlessly access their email, contacts, and calendars using the client application of their choice, including Microsoft Outlook, native iOS and Android email applications, any client application supporting the IMAP protocol, or directly through a web browser.
Mail-in-a-box icon


Take back control of your email with this easy-to-deploy mail server in a box.
MDaemon Messaging Server icon

MDaemon Messaging Server

Email server software with webmail, activesync, IM, antivirus, spam filtering - Simple, secure email for windows. Download free mail server trial.
Gaggle Mail icon

Gaggle Mail

Gaggle Mail gives your group it's own permanent email address (like residents-association@gaggle. email) which anyone in the group can use to reach everyone else in the group.
Knowmail icon


Knowmail's personalized artificial intelligence platform helps users become more successful at work within digital assistants, unified communication, and solution providers.
Zimbra icon


100s of millions of people rely on Zimbra and enjoy enterprise-class open source email collaboration at the lowest TCO in the industry. Discover the benefits!

You can add more alternatives to this item by signing up on

Filter Platforms
Browser (18)
Web (15)
Windows (9)
iOS (9)
macOS (8)
Android (8)
Unix (4)
Filter Features
Email (5)
Email Client (5)
Badging And Points
Blogs And Microblogs
Email Sender
Events And Polls
Hashtags And mentions
Instant Messaging
Integrated Mail
Irc Client
Liking And Commenting
Mail Client
Offline Data Access
POP3 Client
SMTP Client
Send Email
Send Message
Shared Calendar
Snooze Email
Social Analytics
Tags And Tag Clouds
Web Browser
Wikis And Forums

Pros of Thunderbird

Easy setup. Does not require users to know advanced terminology for e-mail settings. All it asks for are your name, e-mail address and password to add an e-mail account.
Completely free.
Ability to create a personalized e-mail address.
Strong open-source community support and troubleshooting.
Highly customizable in appearance.
Powerful anti-spam and phishing filters.

Cons of Thunderbird

Occasional spotty support and updates. At one point Mozilla stopped supporting the program, though they changed their minds and the Thunderbird 59 beta was released in February of 2018. However, this uncertainty increases the likelihood of the program either being changed substantially by another developer or discontinued in the future.
No major new feature updates in several years.
No compatibility with Microsoft Outlook.
Interface a little dated.
The program can experience noticeable lag.

Thunderbird Icon Features of Thunderbird

A completely free e-mail application.
Tabbed e-mail to make switching between and viewing multiple messages easier.
A one-click address book.
All you need to do is click on the star in a message and the sender will automatically be added as a contact.
Has a chat feature that can connect with Facebook Messenger, Google Talk, Twitter and more.
A mail account startup wizard that makes setting up the program and using it from the beginning easy.
Security features such as automatically blocking remote images in e-mails, protection from phishing, automated updates and powerful junk mail filters.

Thunderbird Reviews

by grex about Thunderbird on March 6, 2018:
Thunderbird is a powerful e-mail client and an excellent alternative to paid, premium products. It has many of the same features as its counterparts for the best price - free.

Thunderbird has not had substantial new features added in several years. However, the program retains key features. These include smart folders, tabbed e-mail, powerful search tools and a simple e-mail setup wizard. It also enables a number of add-ons that add additional functions, such as a calendar, to Thunderbird. Like Gmail and Outlook, it searches for words like "attachment" and reminds you to attach a file if you forgot to do so.

Thunderbird is available for Windows, Mac OS and Linux. It is open source and entirely free. Because it is open source, there is a large support community that can help users who are having issues. The interface itself is a little dated, but perfectly serviceable and highly customizable.

The largest downside to Thunderbird is Mozilla's wavering support of the project. The non-profit has made it clear that they would prefer to stop supporting Thunderbird in order to devote more resources to Firefox. While Mozilla has said they will keep Thunderbird and a new beta was just launched in early 2018, their wavering support of the program is a worrying sign for users looking to adopt Thunderbird, especially businesses hoping to integrate it into their operations.

Even if support from current developer Mozilla does cease, other developers have expressed interest in picking it up. If that happens, however, it's very possible the program could see substantial changes or a drop in quality. In short, Thunderbird's future is unknown.

Aside from that unfortunate reality, Thunderbird is an excellent alternative to Microsoft Outlook. It is also an excellent option for anyone with multiple e-mail accounts from multiple hosts to manage their e-mail all in one place.
by Tinus Tate about Thunderbird on January 15, 2019:
An excellent piece of software.
It is stable and i never lost a single email.
I've been using this for over 10 years now and never fell the need to move to another mail program for offline mail.
by syed about Thunderbird on August 5, 2019:
Everything is good but recently it started creating popstate-xx.dat folders and keeps increasing the number of empty folders.
Nobody able to handle this, no support, no solution.
Just keep them deleting and they will keep creating all the time.
Feel free to submit your own opinion on Thunderbird!

Thunderbird Icon Share your opinion on Thunderbird

/ 5
Review Summary
Thunderbird has currently been reviewed with 3 opinions.

In total, that's a combined rating of 4.00 out of 5 stars.

Thunderbird Icon Additional Thunderbird Reviews, Pros & Cons and Similar Software

New: our editorial list of additional articles. We decided to gather informartion all around the internet and present you a list of helpful, external links to interesting reads about Thunderbird reviews, pros & cons and similar software.
0 persons liked this post.
helpful or   not helpful
0 persons liked this post.
helpful or   not helpful
0 persons liked this post.
helpful or   not helpful
0 persons liked this post.
helpful or   not helpful
0 persons liked this post.
helpful or   not helpful
2 persons liked this post.
helpful or   not helpful

Comments on Thunderbird

Any helpful suggestions to make on the list of alternatives to Thunderbird? Feel free to write a comment!

About This Article

This page about Thunderbird was composed by and published by It was last updated on and has been viewed 32604 times.

Did you like this article about Thunderbird? Please rate it!

25 out of 30 people liked this article. This is equivalent to a star rating of 4.17 / 5.

Vote Now:

Like or Dislike

Recommendations For This Article