Errors
sender_mismatch
403 – Sender is not the login.
Sender is not the login. Answered with 403.
What it means
The envelope sender of an SMTP submission is not the address the submitting login owns. One Mailbox sends as itself and as nobody else.
What to do
Submit with the Mailbox's own address as the envelope sender.
The body
{
"type": "https://tigby.eu/problems/sender_mismatch",
"title": "Sender is not the login",
"status": 403,
"detail": "…what was refused, naming this request's own values",
"code": "sender_mismatch",
"doc_url": "https://docs.tigby.eu/errors/sender_mismatch",
"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.