Domain Mismatch

{
  "statusCode": 403,
  "message": "Domain 'company.org' is not verified in your organization.",
  "name": "validation_error"
}

​

Causes & Resolution

1. Unverified Sender Address: The domain specified in the from parameter must be added and have status Verified in your Mailofly dashboard.
2. Typo in Domain: Ensure there are no typos in the from field (e.g. user@acme.co vs user@acme.com).
3. Multi-Organization Context: If your account belongs to multiple organizations, verify that the API key you are using belongs to the organization that owns the verified domain.