In a Word document, create an email complete with heading, greeting, intro, body, conc, salutation, and signature line. The email should be of a serious nature to a company, government entity, employer, It should be single-spaced (as all technical docs are) with double spacing between sections. Think visually using bullet points or numbered lists as appropriate.
Introduction: tell the person very clearly and specifically and upfront why you are in their inbox (why are you writing and what you want)
Body: Explains why you want the reader to take action, provides specific, explains the importance of the issue and/or actions, and provides any other information necessary for understanding.
Conclusion: Reminds the reader what you need them to do, why you need them to do it, provides any contact instructions, and looks to the future.
