Trigger whenever the user wants to do anything with a real email account: check inbox, read messages, reply, forward, compose, send, search, archive, delete. Typical phrasing: "check my inbox", "what did X send me", "查下我邮箱". **Do not use for**: instant messaging / IM / WeChat / Slack, translating text that merely contains the word "email", or offline parsing of `.eml` files (→ just use Read).