Go MAPI

The MAPI-to-Gmail bridge that didn’t exist.

MAPI is the Windows API behind “Send by Email” — right-click a file in Explorer, click Send, and your email client opens with the file attached. Every Windows application that can email uses it: PDF printers, accounting software, scanners, CRMs.

Gmail and Google Workspace have no native MAPI support. The only third-party tool that filled the gap, Affixa, shut down. Go MAPI is the open-source replacement.

It intercepts MAPI calls at the OS level, bridges them to a browser extension via native messaging, and creates a Gmail draft with the attachments ready to send. Works with Chrome and Edge. Handles ANSI and Unicode, multiple attachments, and codepage encoding edge cases that enterprise Windows software loves to produce.

Built because 25 people at work couldn’t right-click “Send by Email” anymore.