Please copy Microsoft Outlook for Android's highly useful feature to swipe an e-mail in the inbox (to the left or to the right) and get presented with a dialogue where you can choose on which date and at which time you want this e-mail to be re-sent to you (additionally with customizable, pre-defined datetimes for easy and quick accessibility). Since many to-dos come in by e-mail and one can also write e-mails to oneself for later reminders (which many people do), this would, with relatively little effort, make the new Thunderbird a notes app on top, too!
That would be really cool! 🙂
Please implement this feature both on mobile and desktop.