>Envelope from? Header from?

I just don't know.  I tried to find the info but could not.  My best guess:
header from.

I'm starting to think what I asked is not possible (at least using
canonical mapping):

Return-Path: whatever or nothing
From: whatever[at]ghi.com

Changed to:

Return-Path: address_2[at]whereto.com
From: whatever[at]ghi.com

I'm trying to ensure any and all emails sent will have a specific
Return-Path, which Return-Path is specified according to the sender's From
header address.  Can this be done?
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