What should be included in a professional email closing?

In a professional email closing, including a polite sign-off and the sender's name is essential as it conveys professionalism and courtesy. A polite sign-off, such as "Best regards" or "Sincerely," helps to leave a positive impression on the recipient, creating a friendly and professional tone. Additionally, signing off with the sender's name provides clarity about who the email is from, which is especially important in formal communication where the recipient may not know the sender personally. This practice helps establish a professional rapport and enhances effective communication.

The other options do not fit well with typical email closing etiquette. A detailed summary of the email can lead to repetition and may not be necessary at the end. An immediate follow-up action is often better suited for the body of the email to clearly outline next steps rather than being included in the closing. Meanwhile, a list of recipients typically belongs in the header or addressing section of the email, not in the closing.