Lessons Know what is and isn't appropriate. Use short, clear sentences and simple punctuation. Write concisely. 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. Follow up.