Every compose surface opens the same schedule menu, and it is the only way to schedule a send. In a reply inside a thread and in the compose window alike, click the chevron attached to the Send button. 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.

Attachments on a scheduled send are limited to 50 MB in total. A larger set is refused when you schedule it, with the two figures named, rather than accepted and then failing silently at the send time.

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.