send_rejected

Message refused. Answered with 502.

What it means

The mail server took the message and refused it on its own account – mailbox full, message too large, relay denied – or refused the submitting sender. Nothing was sent.

What to do

Read the detail: it is the mail server's own reason. Retrying unchanged is unlikely to help.

The body

{
  "type": "https://tigby.eu/problems/send_rejected",
  "title": "Message refused",
  "status": 502,
  "detail": "…what was refused, naming this request's own values",
  "code": "send_rejected",
  "doc_url": "https://docs.tigby.eu/errors/send_rejected",
  "agent_hint": "…the next step, for software"
}

Branch on code. The detail names this request's own Handle, id or limit and is not part of the contract.