While "Danke" is widely used in everyday conversations and informal contexts, it is not typically the best choice in formal emails in German. In professional or official emails, a more polite and respectful form of thank you in German is recommended. Instead of simply saying "Danke," you can use phrases like "Vielen Dank" (many thanks) or "Ich danke Ihnen" (I thank you), as they convey more respect and formality.
For example, when requesting something from a colleague or client, you could say, "Ich danke Ihnen im Voraus für Ihre Hilfe" (I thank you in advance for your help). This is a formal way of expressing gratitude and shows your appreciation for the recipient's time or effort.
In conclusion, while "Danke" is not inappropriate, it’s always better to use more formal alternatives like "Vielen Dank" or "Ich danke Ihnen" when writing professional emails or official correspondence. Choosing the right way to say thank you in German ensures you communicate with proper respect and professionalism.