With the dozens of variations depending on context, position of the writer and recipients, if you know them personally, etc. Canadian comedian François Pérusse

With the dozens of variations depending on context, position of the writer and recipients, if you know them personally, etc. Canadian comedian François Pérusse has a good sketch about those, called Veuillez agréer. I still use them on formal written and printed letters, mostly with contractual stuff, government services. Maybe once or twice a year.