FossaMail

Palemoon’s (Firefox based browser) take on Thunderbird.

12 Alternatives To FossaMail

Airmail

Airmail is a lightweight and lightning fast mail client for Mac.
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Canary Mail

Privacy-aware email app for Mac & iOS
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Claws Mail

Claws Mail is an email client (and news reader), based on GTK+, featuring Quick response

Columba

Columba is an email client written in Java, featuring a user-friendly graphical interface with…
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InboxZero

The best and most innovative mail app to master your overloaded mailbox.

Mailbird

Mailbird is the best email client for Windows 7, 8 and 10
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Outlook

Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
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Postbox

The Power Email App for busy professionals, like you.
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SlideMail

Making email better through artificial intelligence.
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Spark

Spark helps you take your inbox under control. Instantly see what’s important and quickly clean up the rest. Spark for Teams allows you to create, discuss, and share email with your colleagues

Zimbra Desktop

Zimbra Desktop is an offline client that lets you manage various email accounts in one desktop tool. Zimbra mail, Yahoo! mail, Gmail, Outlook and any other work or personal email account using POP or IMAP is easy to set up in Zimbra Desktop.
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eM Client

eM Client is a Windows-based email client for sending and receiving emails, and managing calendars, contacts and tasks.