Slick delayed messaging service

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So it's a delayed message service, but the person knows the message is there, they just can't open it. I may not be the target audience, but if I received such a message, I'd just delete it. I think pretty much everyone I might send such a message to would do the same. Except my mom, who'd call me to say she couldn't open it....
This might have been inspired by this post by Ev Williams The Daily Message: https://medium.com/@ev/the-daily...
Interesting, but is there any way in the app to turn jack on, or jack off when ever you want to?