Style
From CompSciWiki
Header
When writing an email it is appropriate to use headers that describe the date, sender, reciever, and the subject of the email. Here's an example.
DATE: April 3, 3008 TO: Billy Joe FROM: Rob Lumberg SUBJECT: Bridge Proposal
The one thing to notice is that the subject is just a condensed version of the purpose of your email. If you are having trouble condensing your purpose it may mean you need to re-think it.