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Other download sites
Run by third parties, not by David Harris. Prefer the official page above when it works.
About Pegasus Mail
Pegasus Mail describes itself as the Internet's longest-serving PC email system. It is a free Windows email client from David Harris, who also develops the Mercury Mail Transport System, a mail server that is free for private and non-profit users.
Development continues: version 4.91 was released in August 2025, followed by a 4.91/DE release in October 2025. The site includes a guide to using Pegasus Mail with Gmail. The developer asks for donations to support the project.
Strengths
- Free with no paid tier
- Decades of continuous development
- Works with Gmail, with a setup guide provided
- Pairs with the Mercury mail server from the same developer
Limitations
- Windows only
- Traditional interface and slow release pace
- Closed source
Details
- Pricing
- FreeFree to use; the developer accepts donations.
- License
- Proprietary
- Developer
- David Harris
- Platforms
- Windows
- How it runs
- Downloadable app
- Account
- Not required
- Best suited for
- Windows users who want a traditional, free standalone mail client
- Categories
- Email clients
- Last verified
- Added
- Provenance
- Facts checked against the developer's own pages and store listings, 1 sources on file.
Alternatives to Pegasus Mail
Compare allSoftware that can replace Pegasus Mail for an important use case, and what changes if you switch.
Thunderbird
Mozilla’s desktop mail client, with calendar, contacts and a unified inbox, funded by donations rather than ads.
Thunderbird is free and open source under MPL-2.0, runs on Windows, macOS and Linux, and adds a calendar, unified inbox and built-in OpenPGP.
The Bat!
A Windows desktop email client that keeps mail locally, with on-disk encryption and end-to-end encryption.
The Bat! is a Windows client with local message base encryption, tracking pixel blocking and unlimited accounts, but it needs a commercial license.
eM Client
A polished commercial mail, calendar and contacts client for Windows and Mac, with a free tier capped at two accounts.
eM Client adds calendar, tasks and PGP to a polished Windows and Mac client, but its free tier is capped at two accounts and bars commercial use.
Betterbird
A Thunderbird fork that ships extra fixes and features, and can run side by side on the same profile.
Betterbird is a free, open source Thunderbird fork for Windows, macOS and Linux with extra fixes and a portable Windows build.
Claws Mail
A fast, keyboard-driven email client that loads a hundred thousand message folder without thinking about it.
Claws Mail is a free GPL client for Windows, macOS and Linux that handles huge folders quickly, with bundled PGP, spam and RSS plugins.
Wino Mail
Native Windows mail and calendar client for Outlook, Gmail and IMAP accounts.
Wino Mail is a free, open source native Windows client with a Fluent interface and calendar for Outlook, Gmail and IMAP accounts, still filling in features.
Mailbird
Desktop email client for Windows and macOS with a unified inbox.
Mailbird offers a unified inbox and app integrations on Windows and macOS, but its full feature set requires a paid license and it is closed source.
Microsoft Outlook
Microsoft's email, calendar and contacts app for desktop, mobile and the web.
Microsoft Outlook adds calendar, contacts and Microsoft 365 integration across desktop, mobile and web, but ties you to Microsoft services with some paid features.
Similar software
Related functionality, not necessarily a direct replacement.
MailStore Home
Free Windows email archiver for IMAP, Exchange and PST files.
Alpine
A terminal email program descended from Pine, with its full documentation built into the program.
Gmail
Google's email service, used on the web and through Android and iOS apps.
