Exclamation Points in Email
In our electronic age, exclamation points have become very popular pieces of punctuation. They tend to be far more numerous in email than in any other business documents. That is hardly surprising, as many people email in a conversational mode; exclamation points are a way to show enthusiasm for their subject. Unfortunately, an email message full of exclamation points may come across as unprofessional, or sound as though it is coming from someone young and inexperienced. It is best to use them sparingly.
An example of an appropriate context for an exclamation point might be an encouraging email to someone who works with or for you. For example, it is fine to write something like the following:
You did a wonderful job on the background research!
See Section 3.5 (“Aggressive Punctuation in Email”) for additional comments on the exclamation point.