`email_sender_not_smtp`

HTTP 400invalid_request

This sender goes through Parasend; only an SMTP sender has a server.

Handling it

Fix the request and send it again. message says what is wrong, and param names the parameter where there is one. Keep the request_id: it lets Parasend find the request.

The error, as the API returns it

{
  "error": {
    "type": "invalid_request",
    "code": "email_sender_not_smtp",
    "message": "This sender goes through Parasend; only an SMTP sender has a server.",
    "param": null,
    "request_id": "req_5e69684dc3de68bf8651a712"
  }
}