It was from Santa Claus.
Specifically, it was from a professional Santa Claus, introducing my company to his services should we want to hire a Santa (we won't - we have a wonderful employee who plays Santa Claus every year).
However, this was The Boy's response:
Well, I don't think I need to tell you that this is the time of year
when Santa is known to reach out to naughty girls and boys,
letting them know it's not too late to get their act together.