The subject line is also important because it is used to index the message in mailboxes and file folders. Avoid putting text in all capital letters. Use appropriate punctuation and case as you would in a standard business letter. The recipient of your e-mail may feel that you are shouting at them. Keep messages brief and to the point Make your messages concise, not cryptic.
Shorter paragraphs have more impact and are more likely to be read by busy people.
Most people can only grasp a limited number of ideas within a single paragraph, especially on a computer screen. When replying to a message, include enough original material to be understood but no more. It is bad form to reply to a message by including the entire previous message unless it is relevant to an understanding of your response. Format messages for easy reading. White space enhances the look and clarity of an email message, and a blank line only adds a byte to the message.