Keep test traffic away from real users
Point staging SMTP and webhook URLs at us. Test without worrying about emailing real customers: we capture the emails and never deliver them. Webhooks stay here unless you configure forwarding or replay a request.
No card. Free plan: one inbox and one webhook endpoint.
See what staging would have sent.
HTML, text, headers, attachments. Your staging or test app uses our SMTP instead of a real mailbox.
Connect your appSee what providers would have posted.
Body, headers, response you choose. Replay a request, or forward it to localhost while you debug.
Setup guideInspect a capture
Inspect, compare and test
- Inspect and compare emails
- Preview HTML at desktop and mobile widths. Inspect headers, attachments, links and possible verification codes. Check captured content for common issues and compare two messages.
- See why a message looks like spam
- Inspect content spam scores and matched findings, then recheck after a change. These checks assess message content, not inbox placement.
- Test your SMTP error handling
- Simulate temporary 451 failures or permanent 550 rejections for one inbox. The simulation turns off automatically after 15 minutes.
- Fetch captures from tests and agents
- Use the API to retrieve messages, links and webhook payloads in your tests. Connect your code agent through MCP, or forward webhooks to localhost with the CLI.