Validation failed for Recipient: email is invalid

The Synup API returns SY40014 in the errors array when this happens.

What the response looks like

{
  "data": null,
  "errors": [
    {
      "message": "Validation failed for Recipient: email is invalid",
      "context": {},
      "code": "SY40014"
    }
  ]
}

Where it comes from

Documented under Notifications. The context field carries the offending value when one is relevant, and is empty otherwise.

See the full error code reference for every code the API can return.

Other Notifications errors