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
Windows
Linux
BSD
Mac
Haiku

thunderbird is a free, open source, crossplatform email, news and instant messaging client. the project strategy is modeled after mozilla firefox.

it supports pop (storing mail locally on your hard drive so that it can be accessed without an internet connection), and imap. it features excellent mail filter capabilities and management.

thunderbird has strong support for using multiple accounts and identities, including automated signature features.

chat functionality is built in, so you can enjoy realtime conversation with your contacts, right from your favorite messaging application, with multiple supported networks. thunderbird makes it easy to search through both past conversations and received emails.

thunderbird can also function as an rss/atom feed reader, and has a large selection of addons that extend it with calendar support, pgp support, integration with online services and much more.

available also as portable app: http://portableapps.com/apps/internet/thunderbird_portable

Links to official Thunderbird sites

GitHub
Twitter
Facebook
Official Website

Features

Customizable Extensible by Plugins/Extensions Portable Integrated Chat Built in RSS reader Calendar integration Free API Import from Google Reader Integrated Web Browser Multiple Account support Export to OPML Import feeds from OPML POP3 Support Tabbed interface

The Best 70 Thunderbird Alternatives

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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 Android iPhone Android Tablet iPad Web Windows Phone

Built in Calendar Dark theme Signature with image
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Mailbird

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Sync Contacts GSuite Integration Multiple Account support Slack integration Dropbox integration Facebook integration Asana integration Conversation view Trello integration Twitter integration Undo send Unified inbox
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SeaMonkey

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Extensible by Plugins/Extensions Portable Built in RSS reader WYSIWYG Support Integrated Email Client Support for Firefox extensions Modular System
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Privacy focused Ad free Multiple Account support PGP Encryption
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Integrated Spam Protection Multiple languages Built in RSS reader Calendar integration POP3 Support Encrypted email CalDAV CardDAV
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Postbox

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Extensible by Plugins/Extensions Support for IMAP Multiple languages Built in RSS reader Multiple Account support POP3 Support Tabbed interface Onedrive integration Dropbox integration Box.com integration
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Portable Integrated Spam Protection Built in RSS reader Message Filtering
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Customizable Extensible by Plugins/Extensions Support for IMAP Multiple languages Built in RSS reader Multiple Account support Lightweight Content Filtering
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Free Open Source Linux BSD GNOME
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Airmail

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Customizable Multiple Account support Lightweight Dropbox integration Fullscreen support
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Spark

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Free Mac OS X iPhone iPad Apple Watch

Calendar integration Export to PDF
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Support for IMAP POP3 Support Command line interface S/MIME support
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Sync between devices Multiple languages Conversation view Salesforce integration Combined email cloud syncing Focused Inbox Real time pushing
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Icedove

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Extensible by Plugins/Extensions Integrated Chat Built in RSS reader Export to OPML Import feeds from OPML Tabbed interface

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Thunderbird

Links to official Thunderbird sites

Features

Categories

Tags

The Best 70 Thunderbird Alternatives

Microsoft Office Outlook

Mailbird

Apple Mail

eM Client

SeaMonkey

K-9 Mail

Evolution

Postbox

Opera Mail

Claws Mail

Geary

Airmail

Spark

Mutt

Sylpheed

The Bat

Newton Mail

Zimbra Desktop

Kontact - KMail

Icedove

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