💤 Message Snoozing
Tons of requests for this one. We've held off because the Gmail API doesn't support syncing snooze state, but today we're introducing a "Labs" version of this feature that can allow you to perform client-side snoozing.
First, make sure that you're running 0.36.0 (using the menus: Mimestream > Check for Updates…)
Then, choose Mimestream > Preferences…, and there should be a "Labs" tab there.