pcostanza The use of this expression is punishable by law in Germany
And showing any picture of the prophet Muhammad is punishable by death by law in many countries, criticising the chairman of the ruling party is punishable by prison, etc.
Let's be realistic about these things. What is the scenario where somebody would end a letter with that phrase? Maybe a businessman dealing with German colleagues. Do you think a German court of law would go after him for that? Of course not.