Alternatives to Mailbird for Mac 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
Built-in RSS reader Extensible by Plugins/Extensions Extensible by Plugins/Extensions Built-in Calendar ... Calendar integration Categories Customizable Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader Support for IMAP Integrated Chat Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Portable SMTP integration Tabbed interface Support for Themes Add a feature

1757 Like
- It's open source & based on Firefox engine which is known for it's brand !! Guest • Nov 2016 • 1 agrees and 1 disagrees
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.

Commercial Mac OS X Windows Web Android iPhone ... Android Tablet Windows Phone iPad Apple Watch Android Wear
Built-in Calendar Dark theme Signature with image Add a feature

311 Like
Apple Mail

There’s big news attached. The best way to manage email on a Mac gets even better with OS X Yosemite.

Free Mac iPhone iPad
CalDAV CardDAV Bundled with macOS Add a feature

208 Like
Spark

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.

Free Mac iPhone iPad Apple Watch
Calendar integration Cloud sync Configurability Configurable request timeout ... Multiple Account support Export to PDF Sync across Devices Add a feature

60 Like
Postbox

Postbox is an email application that helps you organize your work life and get stuff done. It has all the elegance and simplicity of Apple Mail, but with more power...

Commercial Mac Windows
Multiple Account support Box.com integration Built-in RSS reader Dropbox integration ... Extensible by Plugins/Extensions Support for IMAP Multiple languages Onedrive integration POP3 Support Tabbed interface Visual Programming Add a feature

129 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 $ $ $ Open Source Mac OS X Windows Linux Arch Linux Fedora ... Ubuntu
Dark theme Multiple Account support Email tracking Sync Contacts ... Conversation view Customizable Drag n drop Email Analytics Email tracking & analytics Extensible by Plugins/Extensions Support for IMAP Support for Themes Unified inbox Add a feature

26 Like
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...

Free Open Source Mac OS X Windows Linux Xfce
Command line interface Support for IMAP POP3 Support S/MIME support Add a feature

51 Like
Airmail

Airmail is a lightweight and lightning fast mail client for Mac. Feature list: Accounts: - Unified Inbox and folders - Multi Account with editable html...

Commercial Mac OS X iPhone iPad Apple Watch
Customizable Dropbox integration Fullscreen support Lightweight ... Multiple Account support Add a feature

57 Like
Newton Mail

Newton is a fully featured mail client available for Android, iOS, macOS and Windows. Works for watch too. It's based on cloud so you can connect it to any account...

Commercial Mac OS X Windows Android iPhone Windows RT ... Android Tablet iPad Apple Watch Android Wear
Sync between devices Combined email cloud syncing Conversation view Focused Inbox ... Multiple languages Real-time pushing Salesforce integration Add a feature

39 Like
- Seems really nice and well designed, also has apps for iOS and so on. Will try it for a while! Ola • Feb 2018
Sylpheed

Sylpheed is a simple, lightweight but featureful, and easy-to-use e-mail client (mailer, MUA). Sylpheed runs on many systems such as Windows, Linux, BSD, Mac OS X and...

Free Open Source Mac OS X Windows Linux BSD PortableApps.com
Lightweight Add a feature

51 Like
Polymail

The most powerful platform for email productivity in a beautiful native app — on desktop and mobile.

Freemium Mac OS X iPhone iPad
Sync Contacts Email scheduling Email tracking Multiple Account support Add a feature

20 Like
Canary Mail

Canary is an exciting new email client for Mac that offers a full set of powerful features with one key difference - your emails are not stored on a 3rd party server. ...

Commercial Mac OS X iPhone
No features added Add a feature

9 Like
Zimbra Desktop

The free Zimbra Desktop client allows you to meld the online and offline worlds – storing and synching your email, calendar, contacts, files and documents in the cloud...

Free Personal Mac OS X Windows Linux
No features added Add a feature

29 Like
MailMate

MailMate is an IMAP email client for Mac featuring extensive keyboard control, Markdown supported email composition.

Commercial $ $ $ Mac OS X S/MIME OpenPGP
No features added Add a feature

17 Like
Astro

Modern email and calendar apps for Mac, iOS, Android, Slack and Alexa, powered by Artificial Intelligence. Astro keeps you focused on what's most important.

Free Mac Android iPhone iPad Slack ... Amazon Echo (Alexa Voice Service)
Calendar integration Email tracking Google Calendar integration Multiple Account support ... Snooze reliability Add a feature

20 Like