Create
Enter a brand and work email to create an isolated sandbox tenant.
Free technical pilot
Start with proof, not a card.
Create one isolated tenant, save one token, and hand your agent a complete sandbox. It can test domains, mailboxes, warmup, campaigns, replies, and failures without sending a real email.
Four deliberate steps
From curious to verified.
Coldrig separates a safe evaluation from a production commitment. The agent can prove the workflow while the owner retains the credential, the spending boundary, and the final activation decision.
Secure
Store the one-time tenant token in a password manager or secret environment.
Connect
Add the remote MCP server to Codex, Claude Code, Cursor, or Cline.
Verify
Run simulated setup, campaign, reply, bounce, and timeout paths before deciding.
Owner boundary
Your agent can operate. It cannot invent permission.
The tenant credential scopes access. The service enforces suppression, stop-on-reply behavior, send limits, and state transitions below the prompt layer.
- No real spend in the sandboxSimulated resources only.
- No hidden “free trial” clockThe sandbox is an evaluation environment, not a production allowance.
- No inbox-placement promiseInfrastructure reduces avoidable risk; it cannot guarantee delivery.
- Paid activation is separateCurrent planning price: from $99/mo for 5 mailboxes, then $10 per additional mailbox (a $49 platform fee plus $10 per mailbox, five-mailbox minimum).