- Put people in the "To" line who have action items, or are otherwise the direct focus of the email. E.g.: "Carl, please take care of this"...blah, blah. Use the "CC:" line for people on the email for informational purposes.
- Look in the address header to see where you fit in before you read. Then you'll have a solid idea of whether you are being asked for information or action, or whether you're being informed of a status, data, what-have-you.