The Information Management team have put together this excellent pamphlet on handling email. If nothing else, there is a great tip on setting up a rule that delays sending your mail for 2 minutes. I use this for those times when you think “Oh dear, I really don’t think I meant to say that” or “did I add the attachment?”.

http://www.canterbury.ac.nz/irm/documents/VCOF3004_Email_Management_A5_Brochure.pdf