When sending out e-mails with attachments it may be that only some of the people may need to see the attachments. I would like to propose that as well as "To", "cc" and "Bcc" there is a further send option called (say) FYI. This would only send the body of the e-mail, not the whole thing.
Where I see this working for us is when something like an Action is closed out and part of the Close-out means that there is supporting documentation then the Supporting DOcuments are only sent to those that need it but other personnel are notified that the Action is closed.
Obvious benefit would be the reduction in the Volume of traffic sent out if there is a large distribution list.