Retrieve Mailboxes

{
    "status": 200,
    "message": "Mailboxes fetched successfully",
    "data": {
        "userId": "cmg9jatbj0000jv04cejuz12b",
        "email": "baigt0449@gmail.com",
        "totalMailboxes": 6,
        "mailboxes": [
            {
                "id": "cmg9l78m8000bla04a6onx0ih",
                "username": "Mary",
                "fullName": "Mary",
                "status": "PENDING",
                "createdAt": "2025-10-02T15:45:32.768Z"
            }
        ]
    }
}