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Troubleshooting

Having trouble with Zyntra? Here are some common issues and tips on how to resolve them.

I'm not receiving any emails​

Checklist:

  • Double-check the email address (inbox) you're sending to.
    Example format: [email protected]
  • Ensure your mail is being sent to a valid Zyntra domain (zyntramail.com) and not a typo.
  • Confirm that your sending system actually delivered the email (check SMTP logs).
  • Wait a few seconds — email delivery can be slightly delayed.
  • Try using an ephemeral inbox for test isolation.

I'm getting 401 Unauthorized from the API​

Possible causes:

  • Missing or incorrect API key.
  • Using the wrong header. It should be: 
    X-API-Key: YOUR_API_KEY
  • Make sure your key hasn't been deleted in the dashboard.

Emails don't appear in the Web UI​

Explanation:

  • Only persistent mailboxes are shown in the web UI.
  • Ephemeral mailboxes (e.g. [email protected]) only appear via the API.

If you're testing automated flows, stick with the API to retrieve those messages.

I can't delete a mailbox​

Zyntra doesn't support deleting ephemeral mailboxes (they don't persist).
If you want to delete a persistent mailbox, you can do that from the Mailboxes page in the web UI.

Still stuck?​

If none of the above helped, feel free to reach out: