When the email arrives in your recipient's inbox it's accompanied by the warning that it will self-destruct 60 seconds after they open it. Sadly there are no voice messages or puffs of smoke to add to the drama.
It's worth contacting the recipient before you send the email, as the Snapmail one does look a little suspicious, requiring you to click on a link. Usually we'd advise strongly against this as it's how most phishing attacks take place, fooling the user into clicking on a link to a false version of a website where you unwittingly enter your account details. But in this case it's actually helping you instead.
Just remember to read quickly!
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