As a business owner, you're bound to get that really unpleasant email once in a while. Perhaps it’s a disgruntled employee, a discontent business partner or an unreasonable client. This can be very challenging to reply to. Very much so if the email contains unreasonable demands, claims that (in your view) are untrue, accusations and other unpleasantries. The one thing I can tell you about this is: Never reply to an email, tweet or other types of online communication when you’re emotional.