Pegasus Mail Alternatives

Thunderbird

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

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

Mailbird

Mailbird is more than just another email client - It's an all-in-one communication platform for email, contacts, calendar, apps, task management, video meetings and...

Features:

• Undo send
• Asana integration
• Clean design
• Sync Contacts
• Contacts
• Dropbox integration
• Facebook integration
• GSuite Integration
• Multiple Account support
• News
• Night mode/Dark Theme
• Organize mails
• Sidebar
• Slack client
• Slack integration
• Social network
• Threaded Conversations
• Trello integration
• Twitter
• Twitter integration
• Unified inbox

EssentialPIM

The powerful, full-featured Personal Information Manager for Windows offering Email, Synchronization, Portability, Network support, Android and iOS versions.

Features:

• Notetaking
• Portable

The Bat

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

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...

Microsoft Mail and Calendar

Windows 10 has Mail and Calendar apps already built in. With the Mail application you can now easily see all message from your...

Features:

• Email tracking
• Run in background
• Task Management
• Bundled with Windows

Open365

The open source cloud with LibreOffice online - LibreOffice online + Seafile + KDE. Improve your productivity and communicate better with your team members. The world is...

iRedMail

A fully fledged, free email server solution, an open source project (GPL v2). Use official binary packages from Linux/BSD distributions, with both i386 and x86_64...

Foxmail

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

Features:

• Insert appointment
• Mouse gestures
• POP3 Support
• Portable