Every compose surface opens the same schedule menu, and it is the only way to schedule a send. In a reply inside a thread, click the chevron attached to the Send button. In the full compose window, click the clock icon beside the paperclip. There is no checkbox to toggle first.

The menu offers three send-time presets, each showing the exact moment it resolves to:

• Tomorrow morning, which is 9:00 tomorrow.
• Tomorrow afternoon, which is 13:00 tomorrow.
• Monday morning, which is 9:00 on the next Monday that is not today.
• Pick date and time opens a date and time field for anything else. It will not accept a time that is already past.

Times are your own wall clock, not a server timezone. A preset that has already gone by renders greyed out and reads In the past instead of quietly scheduling backwards. Once a time is set, the Send button reads Schedule send, a confirmation line below it reads Scheduled for … with a Clear link, and the menu gains a Send now instead row.

The inbox sidebar exposes a Scheduled tab with a count badge. Each row shows the recipient, subject, scheduled time, and whether attachments are queued. Two row actions:

• Edit — opens a modal with subject, body, and scheduled-time fields. You can adjust until the worker claims the row at dispatch time.
• Cancel — flips the row to cancelled and the worker skips it. Use any time before send.

This view also carries your pending follow-up reminders. When any are waiting, a Waiting on reply section sits above the queued sends and lists them; see the follow-up reminders article for what they do.