I've sure heard about that delete button but I think it can't replace a sound culture of discussion. In an oral conversation you can't talk 80% of the time. Here, I sometimes get the impression that some people believe the more (and the longer) e-mails they write, the more right they are.
Arbeo
I second this. Sometimes discussions are ended this way before most people even found out it had started. It is not necassary in a discussion to immediately respond to every mail another person writes within 10 seconds of the mail arriving in your inbox. Waiting 24 hours never hurts!
Waerth/Walter