Be considerate with your content Include a subject line for your e-mail that identifies what the content of your message is. Doing this helps the receiver sort through his or her e-mail easier, and refer to the message quicker. Additionally, try to stick to one subject per message. Jumping around can become confusing and hard to follow. Try to keep your messages short and to the point.
Nobody likes to read an excessively long e-mail message.
If you are replying to e-mails and want to include the original message, consider editing the text to eliminate unnecessary elements to help keep the message short by taking out whatever isn't directly applicable to your reply. Basically, take time to edit any quotations down to the minimum necessary to provide a context for your reply. Doing this will help your e-mail easy to read. Don't type in all capitals. It is considered shouting, and it can be hard to read.