go-mapi is a free, open-source Chrome extension designed to enable Gmail and Google Workspace users to send emails directly from Windows applications using the MAPI protocol. It integrates seamlessly with Windows Explorer, allowing users to right-click any file and select 'Send to → Mail recipient' to initiate an email with the file attached. This feature is particularly useful for those who rely on Gmail as their primary email service but have struggled with the lack of native MAPI support in Windows. With no subscription fees and straightforward setup, go-mapi is an accessible solution for enhancing email functionality.

The extension operates through a three-part architecture that ensures security and privacy. It captures email requests from Windows applications, communicates with a local service, and uses the Gmail API to send emails. Users can choose to save emails as drafts or send them immediately, with support for large attachments and international characters. Designed for both individual and enterprise use, go-mapi is a robust tool for anyone looking to streamline their email workflow without compromising on privacy.