Full list

HTTP Status CodeMessage ContentsDetails
200{ id: Integer, status: String }We have accepted the email and are queuing it for delivery. The ID is our internal email ID, the status will always be "pending"
400Invalid API TokenWe can't match your API token to a Domain
400Email from address not parseableOur API is unable to parse the email address you are sending from
400{ To: undefined field }You did not include a To field in your request
400{ To: is invalid }The To field does not contain a valid email address
400{ To: contains a blocked address }An email in the To field is in your blocked addresses list, which we cannot send to
400{ To: number of email addresses exceeds maximum volume }You can send up to 50 emails in one go by including them in the To field, this request has more than 50 emails in the To field
401Missing API TokenYou must include an API token in every request
403Domain DKIM DNS not verified, please complete DKIM VerificationEvery domain must complete DKIM verification before emails can be sent from it
403The organization that owns this domain does not have an active planEach organization must have an active plan to allow emails to be sent
403Verified domain does not match domain in From address of emailThe From address needs to contain exactly the same domain that you have registered, for example, if the email has a From address of, you must be attempting to send using the API token for the address
406Invalid request format or content typeSomething in your request is invalid, check the (Send Reference Documentation)[send] for details
500No contentInternal Server Error - our application is down, contact support if this persists