Can you write Deutschland instead of Germany when sending a letter to from an English speaking country?

No, it is not appropriate to write Deutschland instead of Germany when sending a letter from an English speaking country. When communicating with international recipients, it is generally considered best practice to use the country's official English name. In this case, the official English name of the country is Germany. Using the local name Deutschland could potentially cause confusion or misunderstandings for the recipient, especially if they are not familiar with the German language or culture.