Reminders and mute
Clear a conversation now and have it come back when you need it.
Remind Me
Press H and type when you want the conversation back, in plain words:
fri 5pmin 2 hourstomorrowsomeday
The conversation leaves your Inbox and comes back to the top at that time, with a purple dot. Press ⇥ to choose whether it comes back if no one replies or regardless.
G then H shows every conversation with a reminder.
Remind me about a reply
While writing, ⇧⌘H sets a reminder that starts once the message is sent. If no one has replied by then, the conversation comes back to your Inbox.
Mute
⇧M mutes a conversation: new replies stay out of your Inbox. Press it again to unmute. G then M shows muted conversations.