HTTP 422
Too Many Attachments
The request contains more than 20 attachments. Split the send into multiple requests.
Example response
{
"type": "https://email.squibble.ch/docs/errors/messages/send/too-many-attachments/",
"title": "Too Many Attachments",
"status": 422,
"detail": "...",
"instance": "/api/v1/..."
}