There are several occasions when you want to send emails straight from your iPhone, iPad at future date/time. For example, you might want to remind your co-worker (who's in the other part of the world and at a different timezone) to do an important task while you're in the middle of the night resting. Or you want to auto-notify your customers about a special promo that goes live in the next couple of hours.
Cronote Reminders: Schedule, Send Emails, SMS At Future Date/Time (iPhone/iPad)Cronote Reminders (link) is the new iOS app that allows you to send emails and text messages at a specific date and time. Just specify the sending time, list down the recipients and let your iPhone auto-send that email/text message at predefined time.