“Send to Mail” for Gmail and Google Workspace.

Free forever.

Using it yourself? → Download Free

Deploying for your org? → Join the Managed pilot

The Problem

Windows still has a useful file-sharing workflow: right-click a file, choose “Send to -> Mail recipient”, and start an email with that file attached. Gmail and Google Workspace do not provide that Windows handoff by themselves, so the workflow breaks.

go-mapi restores it with a small Windows desktop app and local DLL interceptor. If you used Affixa , go-mapi covers the same everyday workflow without requiring a browser extension.

Watch the demo

See the Windows “Send to -> Mail recipient” workflow become a Gmail draft.

How It Works

go-mapi v3 installs as a desktop app with a local Windows MAPI interceptor:

Install

Run the Windows installer once. It installs the desktop app and registers the local DLL interceptor.

Intercept

When Explorer, Office, a PDF tool, an ERP system, or another Windows app calls MAPI, the DLL interceptor catches the request locally.

Compose

The desktop app handles the request and opens the Gmail compose flow with attachments. No browser extension, no native messaging host.

The resident desktop app is intentionally small; expect roughly 30-50 MB of RAM while it is running.

Key Features

One Installer

Install the desktop app and DLL interceptor in one pass. No browser extension setup.

Works Everywhere

Any Windows application that uses “Send to -> Mail recipient”: Explorer, Office, Adobe, ERP systems, scanners.

Local by Design

Standalone keeps the mail handoff on the user’s PC. There is no go-mapi server in the send path.

Lightweight Desktop App

The resident app typically uses about 30-50 MB RAM while it waits for Windows mail requests.

Managed Option

Need fleet controls for Google Workspace users? Managed adds deployment and policy features on top of Standalone.

Open Source

Fully open source. Audit the code, contribute, or fork it. No vendor lock-in, no subscription.

Quick Start

Getting started takes less than 2 minutes. Download go-mapi-setup.exe, run it, then try the Windows file-sharing workflow.

The setup app installs go-mapi for Windows. That’s it: right-click any file -> “Send to” -> “Mail recipient” -> Gmail.

Download & Install

Who Is This For?

Google Workspace admins looking for an Affixa replacement
IT departments deploying Gmail in Windows environments (Managed)
Power users who need “Send to → Mail recipient” with Gmail (Standalone)
Developers working with Windows applications that send email

Standalone roadmap

The Standalone client is under active development. These features are on the roadmap:

📋 Mail queue management — hold, review, and send from the browser
👥 Multiple account support — choose which Gmail account to use
🔗 Re-threading — attach emails to existing Gmail conversations
⚙️ Settings page — configure draft-by-default, signatures, and more
📧 SMTP support — send via SMTP as an alternative to Gmail API
🔒 Domain restrictions — limit sending to approved domains