8 Ways to Screw Up an Email - US News

"...With the popularity of emoticons and texting abbreviations, emails have become less formal, just as written letters and cards have gone out of fashion. While you can be informal in your email communications with friends and family, in the office – no matter where you work – you need to take your emails seriously. It can be disastrous to your job and reputation if you make a single typo or if your words are misinterpreted..."

http://money.usnews.com/money/blogs/outside-voices-careers/2014/12/04/8-ways-to-screw-up-an-email