Younger readers may communicate more through social networking sites or text messaging, but in the workplace, many people still use email. You may find yourself having to correspond with your boss, co-workers, clients and even potential employers through this medium. Therefore you should make sure you follow the proper rules of etiquette. After all, you don't want to give a bad impression.
Among the things to which you should be attentive are manner, tone and professionalism. Make sure to check your grammar and spelling. Also refrain from sending attachments without receiving permission from the recipient. Most people, rightfully, are afraid of getting viruses, so even if you know your computer is bug free, the people to whom you send email do not. There's a good chance they won't open the attachment anyway.
Read: Email Etiquette