Here’s a tip from Julie Morgenstern’s book Never Check Email in the Morning.
Avoid sending FYI’s. They clog your inbox and everyone else’s and are a tremendous time drain with little reward. Never send an FYI without telling the reader at the beginning of the message why you think it will be of interest to him/her. For example, send and FYA or For your Awareness to keep you boss on the inside track just in case.