Etiquette is a very important aspect of a business and leaders are expected to know the correct forms of etiquette in the office, in emails , during meals and during work meetings. Electronic communication has become the most widely used tool in business, and for this reason email etiquette is a vital subset of business etiquette. Satterlee (2013) states that there are several basic rules of etiquette when sending an email. One of the most common email etiquette mistakes is hitting the "reply all" button. People also sometimes fail to include a subject line in their email message. Finally, when practicing proper business and email etiquette, you should never send an email written in all caps because it is considered shouting in your face.