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distinction between envelope "MAIL FROM" and header "from:"

2004-03-16 19:34:38
On Tue, Mar 16, 2004 at 01:45:54PM -0500, Greg Cirino - Cirelle Enterprises 
wrote:
| | 
| | "MAIL FROM" aka. "envelope from" refers to the MAIL FROM: <xxx> command 
| | issued from one SMTP to another, and is different from the "From:" header 
| | in the mail.  Basically all headers (From, To, Cc, Received, etc) are part 
| | of the DATA command and could possibly be different (either forged or just 
| | different for some reason).
| | 
| | The exception is often "Return-Path:" especially if it is near the top of 
| | the message, it was probably added by your own mailer, and probably matches 
| | the envelope from address.  (The exception is MAIL FROM: <> which may 
| | appear as Return-Path: <MAILER-DAEMON(_at_)your(_dot_)system>)

Can people please suggest a way for me to improve the online
documentation to clarify and emphasize the distinction betwen envelope
"MAIL FROM" and header "From:"?