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Connect your domain in 5 minutes

Send and receive email from your own domain — no matter where it is hosted. Unsendbox generates the exact DNS records you need and verifies them for you.

How it works

Unsendbox connects to your domain through an SMTP relay (Postmark). You add 4 DNS records, Unsendbox handles the rest.

Works with any DNS host
GoDaddy, Namecheap, Route 53, Cloudflare, Google Domains — if you can edit DNS records, you can use Unsendbox.
Unsendbox tells you what to add
After you connect your domain, Unsendbox generates the exact MX, SPF, DKIM, and return-path records. Copy-paste them into your DNS provider.
One-click verification
Click Verify and Unsendbox checks your DNS in real time. Green across the board means you are ready to send.
What you need before starting
A Postmark account with a server API token. Postmark offers a free tier — no credit card required to get started.

Step-by-step setup

From zero to verified domain in under 5 minutes.

  1. 01Create a free Postmark account at postmarkapp.com and copy your server API token.
  2. 02In Unsendbox, go to Dashboard → Addresses → Domains and click Connect Domain.
  3. 03Enter your domain name, select SMTP Relay, and paste your Postmark token.
  4. 04Unsendbox shows 4 DNS records. Add each one at your DNS provider.
  5. 05Click Verify. Most records propagate in under 5 minutes, though some providers take up to 48 hours.
  6. 06Once all checks pass, your domain is active. Create your first address and send a test email.

Already using Google Workspace?

Keep Google for your team email and add Unsendbox for AI agents — they work side by side without conflict.

Use a subdomain (recommended)
Run Unsendbox on mail.yourcompany.com while Google stays on yourcompany.com. Each has its own MX records — zero interference.
Or forward specific addresses
Keep Google as your primary mail host. Set up Google routing rules to forward selected addresses to Unsendbox for AI processing.
Avoid loops
Forward in one direction only: Google → Unsendbox. Never mirror the same addresses back to Google.

Confirm everything works

Run through this checklist before going live.

  1. 01Domain status shows Active in Dashboard → Addresses → Domains.
  2. 02Domain health check passes for MX, SPF, and DKIM.
  3. 03Test address created and shows Active status.
  4. 04Outbound test email arrives in recipient inbox (not spam).
  5. 05Inbound test email appears in Unsendbox inbox.
  6. 06If using Google Workspace alongside, Google addresses still receive email normally.