go-mapi

Right-click any file in Windows Explorer, click "Send to ? Mail recipient", and the email appears ready to send in Gmail - no configuration needed, no subscription fees, completely open source.

Windows has a built-in email feature called MAPI (Messaging Application Programming Interface) that lets any program send emails through your default email client. This powers:

• "Send to ? Mail recipient" in Windows Explorer • "Email" buttons in PDF readers, Office apps, and thousands of Windows programs • Print-to-PDF-and-email workflows • Document sharing from any application

Gmail and Google Workspace have never supported MAPI. If Gmail is your email provider, these features simply don't work.

go-mapi is the free and open-source

WHAT MAKES GO-MAPI DIFFERENT

? Free & Open Source - No subscription fees, no paid tiers, no feature locks ? Privacy-First - Data stays on your computer until you send; no third-party servers ? Simple Setup - Install extension + run one PowerShell command; works immediately ? Enterprise-Ready - Deployable via Group Policy and Chrome Enterprise Policy ? Active Development - Open source on GitHub with regular updates

KEY FEATURES

• Windows Integration: Makes Gmail your default MAPI email client • Right-Click Sending: "Send to ? Mail recipient" from Windows Explorer • Application Support: Works with any Windows app that uses MAPI • Attachment Support: Send files of any size (up to Gmail's limits) • Draft or Send: Save emails as Gmail drafts to edit later, or send immediately • UTF-8 Support: Handles international characters correctly • Notifications: Desktop alerts when new emails are ready • Chrome & Edge: Works in both browsers

HOW IT WORKS

go-mapi uses a three-part architecture designed for security and simplicity:

1. MAPI Interceptor (DLL) - Captures email requests from Windows applications
2. Native Messaging Host (Local Service) - Watches for new emails and sends them to the browser
3. Browser Extension (This Extension) - Displays emails and uses Gmail API to send

All data stays on your local machine until you explicitly send the email. No third-party servers, no data collection.