United States Postal Service Full Service Approved
Okay, this was a shameless ploy to get you here. I've never heard the fox mention Mail Music Monday but the guys who brought you that viral video created this one. I couldn't find a translation to English so, unless you speak Norwegian, you have to watch the video to get the mail reference.
If you're thinking that you recognize the tune and the beat it's because the Norwegian comedic duo, Ylvis, borrowed it from The Ting Tings song “That's Not My Name.” It's pretty catchy and will probably be stuck in your head for the rest of the day — you're welcome :p