Canary includes a useful Follow-Up feature to help you stay on top of important messages.
To mark an outgoing message for later follow-up:
- Compose an outgoing message.
- Before sending, click/tap the clock icon near the bottom of the window.
To follow up on messages:
- Click/tap the Activity Stream icon.
- On iOS, click/tap the Follow-Up tab.
- From Follow-Up, you can send a reply or simply dismiss the reminder.