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si.Mail Alternatives

si.Mail Alternatives

si.Mail

Published under GPL (you don’t have to pay for it if you are using it, full source code availability),
Localization,
Html message view,
MAPI, e-mail aliases support
Control downloading of images, executing scripts, using ActiveX contros in html messages,
Theme support,
POP3, SMTP, SMTP AUTH, IMAP*, NTLM support for both POP3 and SMTP(yahoo, hotmail,…)* access through plug-ins,
Multiple account support,
Preview mail on Server,
Automatic attachment compression,
Colorize possible dangerous extensions,
Remove of dangerous html tags before putting message to html viewer,
Multiple profile support under one Windows account(profile),
Plug-in support for importing and exporting of messages and address book,
Use anti-virus application to verify attached files before open/save
SSL & TSL connection,…
Use plug-ins and view / print attached files directly from si.Mail
store attachments in separate folder, so messages file can be smaller up to 33%
advanced message search
advanced pre-download, after-download and after-send filters
RSS, Atom feeds support
Minimize to system tray
Portable, just copy full si.Mail folder to USB stick and go with your messages anywhere
Automatic message classification (read description above) (can be disabled to lower memory consumption and make interface simpler)
Calendar and task management supported (can be disabled to lower memory consumption and make interface simpler)
+ a lot more, you can see some features with screenshots and description here

objects marked with * are not yet implemented

Best si.Mail Alternatives for Windows

Are you trying to find the best programs like si.Mail? Have a look at this post and weigh in on your thoughts. Cool!

Thunderbird

Thunderbird

FreeOpen SourceMacWindowsLinuxBSDPortableApps.comHaiku

Thunderbird is a free, open source, cross-platform e-mail, news and instant messaging client. The project strategy is modeled after Mozilla Firefox.

Features:

  • Extensible by Plugins/Extensions
  • Support for IMAP
  • Built-in RSS reader
  • Encryption
  • SMTP integration
  • Add-ons
  • Calendar integration
  • Extensions
  • Multiple Account support
  • Protected by Password
  • Tabs
  • Built-in Calendar
  • Categories
  • Customizable
  • Delivery reports
  • Extensible by Plugins/Extensions
  • Free API
  • Gmail integration
  • Google Calendar integration
  • Import from Google Reader
  • Gui
  • HTML Compose
  • Integrated Chat
  • Integrated Password Manager
  • Integrated Web Browser
  • Intuitive
  • Legacy addons support
  • Export to OPML
  • Import feeds from OPML
  • Organize mails
  • POP3 Support
  • Portable
  • Secure File Sharing
  • Support for POP3
  • Tabbed interface
  • Support for Themes
Microsoft Office Outlook

Microsoft Office Outlook

FreemiumMacWindowsWebAndroidiPhoneAndroid TabletWindows PhoneiPadApple WatchAndroid Wear

Part of the Microsoft Office Suite, Outlook is a personal information manager that lets you manage your e-mail, calendar, contacts, and tasks.

Features:

  • Address book integration
  • Built-in Calendar
  • Calendar integration
  • Exchange
  • Box.com integration
  • Contacts
  • Custom rules
  • 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
  • Todos
  • Unified inbox
  • Yahoo Integration
Claws Mail

Claws Mail

FreeOpen SourceWindowsLinuxBSD

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

Features:

  • Lightweight
  • Built-in RSS reader
  • Content Filtering
  • Customizable
  • Extensible by Plugins/Extensions
  • Support for IMAP
  • Integrated Email Client
  • Multiple languages
  • Multiple Account support
Sylpheed

Sylpheed

FreeOpen SourceMacWindowsLinuxBSDPortableApps.com

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...

Features:

  • Lightweight
  • POP3 Support
  • Portable
The Bat

The Bat

CommercialWindowsS/MIMEOpenPGP

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

Features:

  • Built-in RSS reader
  • Support for IMAP
  • POP3 Support
  • Portable
  • QR code generator
  • Scripting
  • SMTP integration
  • Syncs with GMAIL IMAP
Pegasus Mail

Pegasus Mail

FreeWindows

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.

Features:

  • Support for IMAP
  • POP3 Support

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