Manages Fastmail email and calendar via JMAP and CalDAV APIs. Use for emails (read, send, reply, search, organize, bulk operations, threads) or calendar (events, reminders, RSVP invitations). Timezone auto-detected from system.

通过 JMAP 和 CalDAV API 管理 Fastmail 邮件和日历。可用于邮件操作（阅读、发送、回复、搜索、整理、批量操作、线程）或日历操作（事件、提醒、RSVP 邀请）。时区自动从系统检测。