schedule
reminder to read mail later + send mail at a later time / date - these 2 should go hand in hand - google only implements the first.
Yahoo will be the leader if you can implement these features.
1st
ranked
Paramvir Likhari
shared this idea
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Sangeet Kr Gupta
commented
We need this facility for reminder to customers in future date for payment reminders for sales call reminders
and for sending marketing information to customers, with a "spaced repetition"