What's the name of that song? Something about Mr Postman and "a letter for me"

I'm sitting at my desk and constantly hitting "refresh" on my Inbox, waiting for confirmation of a booking that I have been planning for a few weeks but only got things lined up to make the booking today. It's like the "a watched pot never boils" experience, a watched Inbox never says Inbox (1). Here's hoping tomorrow will bring the answer I am hoping for.