@thomasfuchs Lawyer here. That’s a pretty standard header, actually. The only oddity was “Federal Express” instead of “FedEx.”
At least in my line of work, we have contracts with most of the other companies we interact with that include “Notice” provisions requiring that messages be sent a certain way, e.g. “via email to xyz@domain.com with a copy to So-and-So via trackable carrier.” Including that header on the letter nerfs any argument that that the notice was not properly sent/received.