Messages are often dashed off and sent in the heat of the moment without proof-reading or time to think about the situation. Email also allows user to be more candid than they would be in person. This can be a double-edged sword. While it can have a liberating effect on timid people who would normally not be able to express themselves clearly, it can also lead people to write things that they would never say in person. With the impersonal interface of the computer, it can be easy to forget the connection between the angry letter you are dashing off and the person who will be receiving it.
People can respond immediately and receive immediate feedback.
Unlike email, which can sit unread in a mailbox even after feelings have changed. Treat email correspondence with the same care you would give to any other form of written communication. Rather than dashing off a note and immediately sending it, take the time to proof-read and make sure you say what you mean. Remember, email is more permanent than you may think. Use the spell and language check resources if your email program provides them.