A KaPaPi product for Windows
SendArc
SendArc lets legacy Windows applications send email through Gmail without a desktop mail client. It bridges their Simple MAPI email command into a local preview, then sends only after you confirm the message.
Release candidate: the public Windows beta is still completing its final real-account and installation checks. No downloadable release is being claimed yet.
What stays familiar
Your existing accounting, ERP, CRM or other Windows application keeps using its normal email command. SendArc receives the message locally and shows the recipients, subject, body and attachments before anything is transmitted.
A deliberately narrow Google permission
| Permission | What it allows |
|---|---|
gmail.send | Send the message you approve through Gmail |
| Not requested | Reading your inbox, contacts, Drive files or account profile |
OAuth credentials are stored in Windows Credential Manager. Message content travels directly from the Windows app to Google after the explicit Send action; KaPaPi does not operate a relay that receives or stores the message.
Read the SendArc privacy policy for the complete data flow, retention rules and Google API Limited Use commitment.
Current beta scope
- Windows 10 and Windows 11, with both 32-bit and 64-bit Simple MAPI applications.
- Gmail and Google Workspace accounts.
- Local preview with explicit Send, Cancel and retry behavior.
- Open-source implementation and an unsigned first beta while no paid signing route is used.
Visit the SendArc product site →
Source and compatibility reports: github.com/KapapiDev/sendarc