E-mail headings are predetermined by your system and typically follow memo format: To:, cc:, Subject:, and an automatic From: line with your name as sender. Write messages that readers find helpful, efficient, and courteous.
Use a clear subject line to simplify replying and archiving.
Move promptly to your purpose: state what you need and when.
Be concise, adding headings and space between sections if needed.
Follow company practice as you include or delete a trail of replies.
Observe company etiquette in copying messages to others.
Avoid personal statements, humor, or informality that might undermine your professional credibility.