curl --request PATCH \
  --url https://app.sendmux.ai/api/v1/mailbox/identity \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "text_signature": "<string>",
  "html_signature": "<string>"
}
'

{
  "ok": true,
  "meta": {
    "request_id": "req_clxxxxxxxxxxxxxxxxxxxxxxxxx"
  },
  "data": {
    "id": "<string>",
    "name": "<string>",
    "email": "jsmith@example.com",
    "reply_to": [
      {
        "email": "agent@example.com",
        "name": "Support"
      }
    ],
    "bcc": [
      {
        "email": "agent@example.com",
        "name": "Support"
      }
    ],
    "text_signature": "<string>",
    "html_signature": "<string>",
    "may_delete": true
  }
}