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How to end a letter in german
Be aware of your audience's age.
Language is constantly changing, and this is reflected in verbal as well as written communication. For older generations, it's always safer to go with a more formal letter structure and ending.
For younger generations, you might be able to remain more colloquial. A good rule of thumb is to be more formal (yes, even in informal letters) with people 60 years of age and older.