`too_many_tests`

HTTP 429rate_limited

Too many test e-mails for this sender this hour. Try again later.

Handling it

Wait the number of seconds in the Retry-After header, then try again. Keep the request_id: it lets Parasend find the request.

The error, as the API returns it

{
  "error": {
    "type": "rate_limited",
    "code": "too_many_tests",
    "message": "Too many test e-mails for this sender this hour. Try again later.",
    "param": null,
    "request_id": "req_5e69684dc3de68bf8651a712"
  }
}