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.

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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

Delta Chat
Delta Chat looks and feels like other popular messenger apps, but does not involve centralized control, tracking or selling you, friends, colleagues or family out to large organizations. "Privacy by Design" has never been more fun.
67 Delta Chat alternatives
License model
- Free • Open Source
Application types
- Instant Messenger
- Video Calling App
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Android Tablet
- iPad
- Snapcraft
- Flathub
- F-Droid
+1
Top Delta Chat Features
1. Decentralized
2. Encrypted Email
3. IMAP Support
4. Multiple languages
5. End-to-End Encryption
6. Dark Mode
7. Privacy focused
8. Ad-free
9. Unified inbox
10. Self Destructing Messages
11. Multiple Account support
12. Electron based
Show all NaN Delta Chat features ▾
Delta Chat VS Thunderbird
Is Delta Chat a good alternative to Thunderbird?
Comments about Delta Chat as an Alternative to Thunderbird

BadTek
More like an IM, not a full-featured email client.
Negative comment •Nov 27, 2021
4
GeminiDomino
It doesn't let you read existing email, it's a chat client that uses an IMAP mail server as its back end
Negative comment •Oct 22, 2021
5
Mehrad Mahmoudian
Delta chat (as the name also indicates) is for chatting, and it uses email as a backend. This means user will chat as if they are on WhatsApp or etc. but in background DeltaChat communicates via sending and receiving emails.
Negative comment •Apr 15, 2024
0
Guest
It's an IM over Email client meant to replace messenger type apps.
Negative comment •Sep 12, 2024
0
- This alternative is disputed. Delta Chat is a legitimate Thunderbird alternative, but it might have issues that some users think are important.
- Delta Chat is Free and Open SourceThunderbird is also Free and Open Source
- Delta Chat is Decentralized and Privacy focusedThunderbird is not according to our users

Microsoft Mail and Calendar
Windows 10 has Mail and Calendar apps already built in.
86 Microsoft Mail and Calendar alternatives
License model
- Free • Proprietary
Application types
- Email Client
- Calendar App
Platforms
- Windows
Microsoft Mail and Calendar Features
Run in background
Bundled with Windows
Unified inbox
Email tracking
Show all NaN Microsoft Mail and Calendar features ▾
+3
Discontinued
Mail and Calendar are being phased out and replaced by Outlook. They should be discontinued by the end of 2024.
Microsoft Mail and Calendar VS Thunderbird
Is this a good alternative to Thunderbird?
Comments about Microsoft Mail and Calendar as an Alternative to Thunderbird

Kelson V
Not as capable as Thunderbird, plus I had a harder time getting it to sync with my Nextcloud contacts and calendar. (Not that it'll matter for much longer, since Microsoft is discontinuing it soon anyway.)
Negative comment •Nov 28, 2023
0
RemovedUser
It runs in background unlike Outlook and other email clients.
Positive comment •Feb 9, 2021
2
- Most users think Microsoft Mail and Calendar is a great Thunderbird alternative.
- Microsoft Mail and Calendar is Free and ProprietaryThunderbird is Free and Open Source

Kontact - KMail
KMail is the email component of Kontact, the integrated personal information manager of KDE. Kontact is a personal information manager and groupware software suite for KDE. It supports calendars, contacts, notes, to-do lists, news, and email.
57 Kontact - KMail alternatives
License model
- Free • Open Source
Application type
- Email Client
Platforms
- Linux
- BSD
Kontact - KMail Features
1. Email Organizer
2. Spam Filter
3. Privacy focused
4. Multiple Account support
5. Ad-free
6. Works Offline
7. Tray Icon
Show all NaN Kontact - KMail features ▾
Kontact - KMail VS Thunderbird
Is Kontact - KMail a good alternative to Thunderbird?

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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.

https://www.getmailbird.com
Learn More
Mailpile
Mailpile is a modern, fast web-mail client with user-friendly encryption and privacy features. The development of Mailpile is funded by a large community of backers and all code related to the project is and will be released under an OSI approved Free Software license.
59 Mailpile alternatives
License model
- Free • Open Source
Application types
- Email Client
- WebMail Provider
Platforms
- Linux
- Online
- Self-Hosted
- OpenPGP
Mailpile Features
1. OpenPGP
2. Web-Based
3. Encrypted Email
4. IMAP Support
5. POP3 Support
Show all NaN Mailpile features ▾
Mailpile VS Thunderbird
Is Mailpile a good alternative to Thunderbird?
- Mailpile is the most popular Self-Hosted alternative to Thunderbird.
- Mailpile is Free and Open SourceThunderbird is also Free and Open Source

Mutt
Mutt is a small but very powerful text-based mail client for Unix operating systems. Some of its features are: color support, message threading, MIME support (including RFC2047 support for encoded headers), PGP/MIME (RFC2015), various features to support mailing lists, including...
55 Mutt alternatives
License model
- Free • Open Source
Application type
- Email Client
Platforms
- Mac
- Windows
- Linux
- Xfce
Mutt Features
1. Tui
2. PGP Encryption
3. Console-based
4. Text-based
5. Command line interface
6. IMAP Support
7. POP3 Support
8. S/MIME Support
Show all NaN Mutt features ▾
Mutt VS Thunderbird
Is Mutt a good alternative to Thunderbird?
Comments about Mutt as an Alternative to Thunderbird

Guest
Thunderbird users want a GUI mail application. Mutt is a command line mail application. They are both good and both popular, but very much apples and oranges.
Negative comment •Apr 21, 2020
16
- Most users think Mutt is a great Thunderbird alternative.
- Mutt is Free and Open SourceThunderbird is also Free and Open Source

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.
30 BlueMail alternatives
+2
License model
- Free Personal • Proprietary
Application type
- Email Client
Platforms
- Mac
- Windows
- Linux
- Android
- iPhone
- Chrome OS
- Android Tablet
- iPad
- Apple Watch
BlueMail Features
1. Unified inbox
2. IMAP Support
3. Ad-free
4. GDPR Compliant
5. Lightweight
6. Multiple Account support
7. Calendar Integration
8. POP3 Support
Show all NaN BlueMail features ▾
BlueMail VS Thunderbird
Is BlueMail a good alternative to Thunderbird?
Comments about BlueMail as an Alternative to Thunderbird

Guest
bluemail pushes all your mail into their clud making it insecure
Negative comment •Oct 30, 2019
25
Guest
It works on Android, but is not so powerfull.
Positive comment •Sep 13, 2019
0
Guest
clear, easy to use lots of flexibility
Positive comment •Dec 16, 2018
-2
- Most users think BlueMail is a great Thunderbird alternative.
- BlueMail is Free Personal and ProprietaryThunderbird is Free and Open Source
- BlueMail is LightweightThunderbird is not according to our users

Sylpheed
Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA).
46 Sylpheed alternatives
License model
- Free • Open Source
Application type
- Email Client
Platforms
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
+3
Sylpheed Features
1. Lightweight
2. Portable
3. Gtk
4. POP3 Support
5. IMAP Support
Show all NaN Sylpheed features ▾
Sylpheed VS Thunderbird
Is Sylpheed a good alternative to Thunderbird?
Comments about Sylpheed as an Alternative to Thunderbird

Guest
It doesn't encrypt password storage and doesn't have Master Password function
Negative comment •Apr 6, 2019
3
- Most users think Sylpheed is a great Thunderbird alternative.
- Sylpheed is Free and Open SourceThunderbird is also Free and Open Source
- Sylpheed is LightweightThunderbird is not according to our users