Opera Mail

Opera Mail powerfully organizes, indexes, and sorts your messages. It has spam filtering (both automated and Bayesian), supports POP3 and IMAP, newsgroups as well as Atom and RSS feeds.

Free
Mac OS X
Windows

opera mail powerfully organizes, indexes, and sorts your messages.

it has spam filtering (both automated and bayesian), supports pop3 and imap, newsgroups as well as atom and rss feeds.

opera mail uses one database that keeps an index of all mail, and sorts the messages automatically into several "views" or accesspoints. messages are automatically sorted by type, such as mailing lists, and mail with attachments . this approach to indexing allows for quicker access to messages. for instance, a message sent to a mailing list with a word document attached will appear in both the "documents" attachment view and in the "mailing lists" view. opera mail can also use bayesian filtering to automatically sort messages into other views. all messages in the database are accessed by opening the "received" view.

Links to official Opera Mail sites

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Official Website

Features

Portable Integrated Spam Protection Built in RSS reader Message Filtering

The Best 38 Opera Mail Alternatives

1709 Like

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

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
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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 Android iPhone Android Tablet iPad Web Windows Phone

Built in Calendar Dark theme Signature with image
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Inbox by Gmail

Built on everything that we've learned from Gmail, Inbox is a fresh start that goes beyond email to help you get back to what matters. Bundles, because some messages just belong together. Promotions are now neatly organised.

Free Android iPhone iPad Chrome OS Web Chrome

Sync with Google Calendar Mobile friendly No Exchange/365 Support To Do management
202 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 OS X iPhone iPad
177 Like

eM Client

eM Client is a full featured e-mail client with a modern and easy to use interface. eM Client also offers calendar, tasks, contacts and chat.

Freemium Windows

Support for IMAP Calendar integration POP3 Support Dark theme Encrypted email Conversation view Automatic Backup Built in themes Built in translation Combined Inbox Email preview Imports email from Live mail Tasks managment
165 Like

K-9 Mail

K-9 is an open source email client for Android with multi-folder sync, email signatures, Bcc-to-self, return-address configuration, keyboard shortcuts, Exchange Support, message flagging, IMAP deletes, saving attachments, configurable...

Free Open Source Android Android Tablet

Privacy focused Ad free Multiple Account support PGP Encryption
146 Like

Evolution

Evolution is the official personal information manager and workgroup information management tool for GNOME. It combines e-mail, calendar, address book, and task list management functions.

Free Open Source Linux BSD S/MIME GNOME OpenPGP

Integrated Spam Protection Multiple languages Built in RSS reader Calendar integration POP3 Support Encrypted email CalDAV CardDAV
75 Like

Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response Graceful, and sophisticated interface Easy configuration, intuitive operation Abundant features Extensibility ...

Free Open Source Windows Linux BSD Xfce

Customizable Extensible by Plugins/Extensions Support for IMAP Multiple languages Built in RSS reader Multiple Account support Lightweight Content Filtering
69 Like

Geary

Geary is an email application built for GNOME 3. It allows you to read and send email with a simple, modern interface.

Free Open Source Linux BSD GNOME
51 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 OS X iPhone iPad Apple Watch

Calendar integration Export to PDF
49 Like

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 other Unix-like systems. Sylpheed uses GTK+ GUI toolkit.

Free Open Source Mac OS X Windows Linux BSD
46 Like

The Bat

The Bat! is a secure email client software, built to protect your correspondence against third-parties. .

Commercial Windows S/MIME OpenPGP

Portable Support for IMAP Built in RSS reader POP3 Support
38 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 and get fast search, push notifications, read receipts (PREMIUM), etc .

Commercial Mac OS X Windows Android iPhone Android Tablet iPad Windows RT Apple Watch

Sync between devices Multiple languages Conversation view Salesforce integration Combined email cloud syncing Focused Inbox Real time pushing
21 Like

Icedove

icedove is the thunderbird email client rebranded by debian .

Free Open Source Linux Xfce

Extensible by Plugins/Extensions Integrated Chat Built in RSS reader Export to OPML Import feeds from OPML Tabbed interface
20 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 Multiple Account support Email tracking Email scheduling
20 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 Android iPhone iPad Mac Slack Amazon Echo (Alexa Voice Service)

Calendar integration Multiple Account support Email tracking Google Calendar integration Snooze reliability
18 Like

Microsoft Mail and Calendar

windows 10 has mail and calendar apps already built in.

Free Windows Windows RT
17 Like

TypeApp

TypeApp is an all-free, beautifully designed, universal email app, capable of managing unlimited number of mail accounts from various providers, allowing for smart push notifications while enabling personalization across multiple email...

Free Personal Android iPhone Android Tablet iPad Android Wear Kindle Fire

Multiple Account support Live Push Notifications Unified inbox
16 Like

MailMate

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

Commercial
14 Like

Foxmail

Foxmail is a free POP3 and IMAP4 e-mail client in English and Chinese for Windows systems.

Free Windows

Portable POP3 Support Mouse gestures

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Opera Mail

Links to official Opera Mail sites

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The Best 38 Opera Mail Alternatives

Thunderbird

Microsoft Office Outlook

Inbox by Gmail

Apple Mail

eM Client

K-9 Mail

Evolution

Claws Mail

Geary

Spark

Sylpheed

The Bat

Newton Mail

Icedove

Polymail

Astro

Microsoft Mail and Calendar

TypeApp

MailMate

Foxmail

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