Alternatives to si.Mail for all platforms 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
Extensible by Plugins/Extensions Built-in RSS reader Support for IMAP Multiple Account support ... SMTP integration Add-ons Built-in Calendar Calendar integration Categories Customizable Delivery reports Extensible by Plugins/Extensions Free API Gmail integration Google Calendar integration Import from Google Reader HTML Compose Integrated Chat Integrated Password Manager Integrated Web Browser Legacy addons support Open Source apps Export to OPML Import feeds from OPML Protected by Password POP3 Support Portable Secure File Sharing Tabbed interface Support for Themes Add a feature

1897 Like
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.

Freemium $ $ $ Mac Windows Web Android iPhone ... Android Tablet Windows Phone iPad Apple Watch Android Wear
Built-in Calendar Box.com integration Calendar integration Dropbox integration ... Email scheduling Exchange Integration Flight Status Gmail integration ICloud Integration Integrated Search Multiple Account support Night mode/Dark Theme Office 365 integration Onedrive integration Organize mails Shared calendars Signature with image Smart attachments Unified inbox Yahoo Integration Add a feature

340 Like
Claws Mail

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

Free Open Source Windows Linux BSD
Lightweight Built-in RSS reader Content Filtering Customizable ... Extensible by Plugins/Extensions Support for IMAP Integrated Email Client Multiple languages Multiple Account support Add a feature

86 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...

Free Open Source Mac Windows Linux BSD PortableApps.com
Lightweight POP3 Support Portable Add a feature

56 Like
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...

Free Open Source Mac Windows Linux BSD
No features added Add a feature

34 Like
The Bat

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

Commercial Windows S/MIME OpenPGP
Built-in RSS reader Support for IMAP POP3 Support Portable ... Scripting SMTP integration Syncs with GMAIL IMAP Add a feature

47 Like
Pegasus Mail

Pegasus Mail is a free, standards-based electronic mail client suitable for use by single or multiple users on single computers or on local area networks.

Free Windows
POP3 Support Add a feature

10 Like

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Feature

Category

Tags

Alternatives to si.Mail for all platforms with any license

Thunderbird

Microsoft Office Outlook

Claws Mail

Sylpheed

Kontact - KMail

The Bat

Pegasus Mail

Platforms

License

si.Mail Comments

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