Careful with Humor:

You can be funny with people you share the same humor but in some situations even that can be misinterpreted and you will end up being on the receiving end. So, it is better to avoid humor in writing.

 People from different cultures speak and write differently:

Mishaps might happen when communicating to people with different cultural backgrounds. High-context cultures such as Japanese, Arab, and Chinese want to know with whom they are doing the business than what the business is about. And low-context cultures like German, American and Scandinavian cares for getting to the point. So make sure you know this basic knowledge while communicating.

Reply to your email- knowing, it is not meant for you:

You may be busy but take time to reply to your emails even it is not meant to you. It is good email etiquette to have as a professional.

Here is an example, reply: "I know you're very busy, but I don't think you meant to send this email to me. And I wanted to let you know so you can send it to the correct person."
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