> I bet 99.99% of all email is delivered within a minute or so of being send No doubt that is true. However, given the total volume of email, even that tiny, t

> I bet 99.99% of all email is delivered within a minute or so of being send No doubt that is true. However, given the total volume of email, even that tiny, tiny remaining fraction still represents actual mail with legitimate use-cases. So it's good to bear that fact in mind and not roughly implement 80-20 stuff that tramples on those.