Know what is and isn't appropriate.
Use short, clear sentences and simple punctuation.
Avoid clumsy phrases, complex vocabulary, and stiff language.
Format for readability.
Proofread your e-mails.
Write a clear, meaningful subject line.
Write an informative beginning.
Focus: write enough but not too much.
Use headings, generalizations, and paragraphs.
Write a cordial, informative conclusion.