{"service": "mailcode", "usage": {"/code": "?email=<邮箱> 或 ?link=<短链>；可加 wait=秒 interval=秒 mailbox=INBOX|Junk prefer=official|shortlink|token", "/mail": "同上，返回原始邮件列表（不挑码）", "/mailboxes": "列出已登记邮箱", "/health": "存活检查"}}