You wrote
Also remember that most of us "professionals" are forced to use MS Outlook for our mail client, and Outlook makes it impossible (or at least difficult) to bottom-post or inter-post and understand what is new text, and what is from the previous e-mail - It doesn't add ">" to the start of lines from the previous e-mail to delineate who said what.
Properly setup and using plain text, outlook does add ">"
Gerald