It's becoming increasingly easier for people over-seas to get access to internet, but still not quite easy enough for them to write any good or relatively long messages to loved ones. Its not a suggestion I've heard before, and I'm not sure if its a popular suggestion, but it would at least be interesting if you could post date messages for delivery, it would also allow the forgetful to send birthday messages to people they care for without actually having to remember birthdays, which is a tad pathetic, but something I'm sure people would thank you for no less... Point is people over-seas could write long heartfelt messages to their loved ones and post date them, then edit them if need be. I understand that a draft is basically the same thing as a post-dated message, accept the automatic sending option allows the message to be sent on an anniversary, birthday, holiday, or whatever the circumstances may be, even if the person couldn't get to the computer that day. The same theoretically applies for any other busy individual, or someone with only occasional or limited access to a computer, or simply lazy, or apathetic towards relevant dates.
Anyways, I definitely wouldn't prioritize this feature, being as you've no doubt got hundreds of suggestions that would have more impact, however, on the off chance you find the time, or it would be relatively easy to do, it would be a nice add. Thanks for the time.