MailClient
The premium Open Source alternative to Outlook
🎯 Best for:Users needing a modern, secure desktop email client that supports Microsoft 365 and standard IMAP.
What is MailClient?
A cross-platform desktop email client that supports modern authentication protocols including Graph API and IMAP OAuth. It provides a unified inbox for managing multiple accounts across Windows, Mac, and Linux.
Tech Stack
JavaEmail Clients & Services
Why MailClient?
- • Unified inbox
- • Modern OAuth support
- • Cross-platform consistency
Limitations
- • High memory usage (Electron)
- • No mobile companion app
- • Basic email filtering
2/20/2026
Last Update
3
Forks
0
Issues
Unknown
License
Financial Leak Detected
Stop the "SaaS Tax"
Your team could be burning cash. Switching to MailClient instantly boosts your runway.
Competitor Cost
-$1,440
/ year (est. based on Outlook)
Self-Hosted
$0
/ year
Team Size10 Users
150+
SAVE 100%