Sign email. Sign your name so I know who with whom I am communicating.
Use Multiple Paragraphs. Do use just one one long paragraph.
Number Questions. If you have more than one question or point, number them so I can refer to the numbers in the reply.
Avoid Gaudy Stuff. Avoid fancy formatting, gaudy colors, and flowery backgrounds; they make reading difficult.
Use proper grammar and punctuation. Do not use text messaging shorthand.
Thank you
Much time and effort goes into providing accurate, detailed, well thought-out answers to all questions. Even if you don't agree with the answer you receive, a simple thank you shows that you received the answer and appreciate the effort that went into preparing it.