Thunderbird Alternatives

Thunderbird is described as 'Free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox' and is a leading Email Client in the office & productivity category. There are more than 50 alternatives to Thunderbird for a variety of platforms, including Windows, Mac, Linux, Android and iPhone apps. The best Thunderbird alternative is K-9 Mail, which is both free and Open Source. Other great apps like Thunderbird are Claws Mail, Evolution, SeaMonkey and Geary.

filter to find the best alternatives

Thunderbird alternatives are mainly Email Clients but may also be Calendar Apps or Web Browsers. Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Thunderbird.

Thunderbird

2385

Email Client
Free • Open Source

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

More about Thunderbird

Thunderbird alternatives page was last updated Sep 26, 2024

Apple Mail
There’s big news attached. The best way to manage email on a Mac, according to Apple.
78 Apple Mail alternatives
License model
- Free • Proprietary
Application type
- Email Client
Platforms
- Mac
- iPhone
- iPad
Top Apple Mail Features
1. Bundled with macOS
2. Email Organizer
3. Multiple Account support
4. Dark Mode
5. Spam Filter
6. CalDAV Support
7. CardDAV Support
8. Exchange
9. Rich text editing
10. Encrypted Email
11. Customizable
Show all NaN Apple Mail features ▾
Apple Mail VS Thunderbird
Is Apple Mail a good alternative to Thunderbird?
Comments about Apple Mail as an Alternative to Thunderbird

Guest
I have used Thunderbird with IMAP for years, but the tiny font problem on Mac is now a dealbreaker, and with my decades of emails and folders, Thunderbird is flailing when fetching ail or moving folders. Apple Mail does what I need it to: manage multiple Gmail accounts, not be too slow, and let me adjust font size. The arrangement of folders/mailboxes in Apple Mail is not as intuitive as Tbird but I can deal with that.
Positive comment •Jan 9, 2018
2
Guest
You must download all your emails and there is no option to limit it!
Negative comment •May 11, 2017
-7
- Some users think Apple Mail is a great Thunderbird alternative, some don't.
- Apple Mail is the most popular iPhone & iPad alternative to Thunderbird.
- Apple Mail is Free and ProprietaryThunderbird is Free and Open Source

Mailbird
Mailbird helps individuals and businesses manage emails in one place. This allows you to simplify your workflows. Therefore, spend more time on important tasks.
65 Mailbird alternatives
License model
- Freemium • Proprietary
Application type
- Email Client
Platforms
- Windows
+2
Top Mailbird Features
1. Clean design
2. Sync Contacts
3. Dark Mode
4. Undo send
5. Email tracking
6. Unified inbox
7. GSuite Integration
8. Slack integration
9. Multiple Account support
10. Email template editor
11. Email Organizer
12. Spam Filter
Show all NaN Mailbird features ▾
Mailbird VS Thunderbird
Is Mailbird a good alternative to Thunderbird?
Comments about Mailbird as an Alternative to Thunderbird

Guest
Mailbird is missing most of the features which Thunderbird offers, like encryption and plugins
Negative comment •Jan 2, 2016
11
Ian James
Clean interface, much faster than Thunderbird. One touch unsubcribe is a nice touch and adding new accounts is a breeze
Positive comment •Jun 2, 2021
0
Guest
Great design. Great features
Positive comment •Apr 21, 2021
0
thiztatyanarein
asone user said "Mailbird is missing most of the features which Thunderbird offers, like encryption and plugins" more than year ago: now Thunderbird is dead, no development, no plugins (never was a lot and now even less as they are following the plan as to with Firefox. Is dead. Loved thunderbird, not a fan of Mailbird! but I can't stand oputlook
Positive comment •Jun 28, 2017
-3
- Some users think Mailbird is a great Thunderbird alternative, some don't.
- Mailbird is Freemium and ProprietaryThunderbird is Free and Open Source

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 settings including encryption via OpenPGP and S/MIME and reformatted emails to avoid phishing.
44 FairEmail alternatives
+5
License model
- Freemium • Open Source
Application type
- Email Client
Platforms
- Android
- Android Tablet
- F-Droid
Top FairEmail Features
1. Privacy focused
2. Multiple Account support
3. Customizable
4. Email Notifications
5. PGP Encryption
6. Extensive settings menu
7. IMAP Support
8. Notifications
9. No Tracking
10. Works Offline
11. Ad-free
12. Unified inbox
Show all NaN FairEmail features ▾
FairEmail VS Thunderbird
Is FairEmail a good alternative to Thunderbird?
Comments about FairEmail as an Alternative to Thunderbird

ByteRanger
While I do use FairEmail on my mobile devices and like it, it is not a valid alternative to Thunderbird which is for desktop platforms.
Negative comment •Jul 25, 2023
-2
Guest
wrong platform. FairEmail is not an alternative for Thunderbird users because it only runs on android. Thunderbird is for desktop operating systems only.
Negative comment •Oct 8, 2020
-7
- Most users think FairEmail is a great Thunderbird alternative.
- FairEmail is Freemium and Open SourceThunderbird is Free and Open Source
- FairEmail is Privacy focusedThunderbird is not according to our users

Ad
eM Client
Looking for a full-featured email client with a modern and easy-to-use interface? Look no further than eM Client. Rated 3 out of 5, eM Client is a popular alternative to Thunderbird, offering all the features you need to manage y...

https://www.emclient.com
Learn More
Microsoft Outlook
Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.
137 Microsoft Outlook alternatives
License model
- Paid • Proprietary
Application types
- Email Client
- Calendar App
Platforms
- Mac
- Windows
- Online
- Android
- iPhone
- Android Tablet
- iPad
- Apple Watch
- Android Wear
+7
Top Microsoft Outlook Features
1. Exchange
2. Native application
3. Email Organizer
4. Calendar Integration
5. Calendar View
6. Support for Aliases
7. Multiple Account support
8. Works Offline
9. Cloud Sync
10. Unified inbox
11. Dark Mode
12. Support for @mentions
Show all NaN Microsoft Outlook features ▾
Microsoft Outlook VS Thunderbird
Is Microsoft Outlook a good alternative to Thunderbird?
Comments about Microsoft Outlook as an Alternative to Thunderbird

Eyji
As a Firefox user, I have tried to love Thunderbird but it just can't compete with Outlook, IMHO.
Top positive comment •May 23, 2019
4
Guest
It works. Much less buggy. Better integration with Windows. Encryption/Signing.Works over remote desktop without losing pieces of itself. Search is crappier though.
Top positive comment •Feb 13, 2020
2
LinuxDoge
Not open source, not privacy-focused, no Linux support
Top negative comment •Mar 24, 2022
2
Guest
outlook is clumsy and bloated and does nothing well. tbird does one thing and well.
Negative comment •Jun 12, 2020
3
Guest
Outlook do not support RSS
Negative comment •Jul 28, 2016
0
- Some users think Microsoft Outlook is a great Thunderbird alternative, some don't.
- Microsoft Outlook is the most popular Web-based alternative to Thunderbird.
- Microsoft Outlook is the most popular commercial alternative to Thunderbird.
- Microsoft Outlook is Paid and ProprietaryThunderbird is Free and Open Source

Spark Mail
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.
62 Spark Mail alternatives
License model
- Freemium • Proprietary
Application types
- Email Client
- Calendar App
Platforms
- Mac
- Windows
- Android
- iPhone
- iPad
- Apple Watch
+3
Top Spark Mail Features
1. Multiple Account support
2. Email Scheduling
3. Snooze Mail
4. Cloud Sync
5. Dark Mode
6. Calendar Integration
7. Email Organizer
8. Works Offline
9. Unified inbox
10. Mail Filtering
11. Ad-free
12. Calendar View
Show all NaN Spark Mail features ▾
Spark Mail VS Thunderbird
Is Spark Mail a good alternative to Thunderbird?
Comments about Spark Mail as an Alternative to Thunderbird

folkomaton
Free, simple, reliable, easy to manage multiple accounts, fair amount of customization, synchronisation, templates
Positive comment •Apr 24, 2020
0
rmpbklyn
no sorting, dont show allmail for gmail
Negative comment •Jun 10, 2018
-3
- Most users think Spark Mail is a great Thunderbird alternative.
- Spark Mail is Freemium and ProprietaryThunderbird is Free and Open Source

Postbox
Postbox is an email application that helps you organize your work life and get stuff done.
66 Postbox alternatives
License model
- Paid • Proprietary
Application type
- Email Client
Platforms
- Mac
- Windows
+9
Top Postbox Features
1. Multiple Account support
2. Extensible by Plugins/Extensions
3. Exchange
4. Box.com integration
5. Tabbed interface
6. Dropbox integration
7. IMAP Support
8. Built-in RSS reader
9. S/MIME Support
10. Multiple languages
11. Onedrive integration
12. Visual Programming
Show all NaN Postbox features ▾
Postbox VS Thunderbird
Is Postbox a good alternative to Thunderbird?
Comments about Postbox as an Alternative to Thunderbird

Bryan G
You shouldn't call something that costs $80 as an alternative to something that is free.
Positive comment •Jul 3, 2022
0
Jack Vegas
If you're using Windows 10 or a Mac, Postbox is hard to beat. I found myself so impressed with the trial that I had to buy the license in the end.

It started out looking a lot like Thunderbird, but it really has come into its own over the past few years to the point where Thunderbird has nothing on Postbox.
Positive comment •Apr 12, 2020
-1
- Most users think Postbox is a great Thunderbird alternative.
- Postbox is Paid and ProprietaryThunderbird is Free and Open Source

eM Client
Looking for a full-featured email client with a modern and easy-to-use interface? Look no further than eM Client. Rated 3 out of 5, eM Client is a popular alternative to Thunderbird, offering all the features you need to manage your email, calendar, tasks, contacts, notes, and chat all in one place.

With s...
64 eM Client alternatives
License model
- Freemium • Proprietary
Application types
- Email Client
- Calendar App
Platforms
- Mac
- Windows
- Android
+5
Top eM Client Features
1. IMAP Support
2. Calendar Integration
3. Multiple Account support
4. PGP Encryption
5. Exchange
6. Dark Mode
7. Unified inbox
8. Cloud Sync
9. Email Organizer
10. Sync with Google Calendar
11. Automatic Backup
12. CardDAV Support
Show all NaN eM Client features ▾
eM Client VS Thunderbird
Is eM Client a good alternative to Thunderbird?
Comments about eM Client as an Alternative to Thunderbird

3psilon
A good Windows alternative if you use 1-2 mailboxes or don't mind paying.
Top positive comment •Sep 3, 2017
2
Guest
Thunderbird is brutal, emClient is clean, neat, well thought out, etc. It works with Exchange, Gmail, etc. Everything in one install. Drop in replacement for Outlook at a fraction of the price for Business.
Top positive comment •Jul 31, 2017
6
LinuxDoge
doesnt support Linux, isnt open source, not configurable enough
Top negative comment •Mar 24, 2022
1
I am spezticle
After installing I got malwarebytes and AVG antivirus alerts containing threats of phishing with urls such as "http://walmartsurvys.us/apple-touch-icon-precomposed.png" by way of the eM Client executable "MailClient.exe" There was a dozen more of them

Do not install this phishing trash
Negative comment •Jan 16, 2023
1
Guest
closed source program that doesn't do a lot of what thunderbird can
Negative comment •Sep 4, 2022
0
Show more comments
5 of 12 comments
- Most users think eM Client is a great Thunderbird alternative.
- eM Client is Freemium and ProprietaryThunderbird is Free and Open Source