How often does this scenario happen to you? You send an email and refer to an attachment and once you press the send button you realize that you forgot to attach the file. And then you have to send a new embarrassing email with the attachment.
I just read a blog post by Steven Smith where he describes a rule he created in Outlook that delays all the emails he sends with one minute, which often is enough to realize your mistake. I just created one myself so no more mistakes from me… at least in this area J