Product guide

SendArc documentation

Install, connect, preview, send, and troubleshoot the Windows beta.

Last updated 27 August 2026

Before you install

SendArc currently supports 64-bit Windows 10 and 11, Gmail or Google Workspace, and Windows applications that invoke Simple MAPI. Keep your existing mail-handler configuration until you have tested your workflow.

Install and connect

  1. Download the versioned installer and compare its SHA-256 hash with SHA256SUMS.txt.
  2. Install as an administrator so both 64-bit and 32-bit MAPI registrations can be configured.
  3. Open SendArc and connect Google. The app requests only gmail.send.

Send safely

Start an email action in your legacy application. SendArc shows recipients, subject, body, and attachment names locally. Nothing is sent until you press Send in that preview.

Troubleshooting

If a message does not appear, confirm your application uses Simple MAPI and report the application name, version, Windows architecture, and sanitized reproduction steps through the support page. Never attach private mail or OAuth tokens.