On Thu, Sep 20, 2018 at 10:19 AM, Dave Sergeant wrote:

A 'reply to sender' option is essential as some seem incapable of reading this in the 'from' line.

Or even a line that reads:   This message was sent by <fill in from address here>

The problem is, as you've noted, that there is no easy way for a plain-text message recipient to "go private" with the originator of any given message, at least in the e-mail interface.  The "Private" button exists for all messages in the web interface, but that's not helpful in any way to those participating by e-mail.

My big desire is to have something that will allow the recipient of a plain text message to initiate an "off-list" correspondence with the message's sender if that's what they want to do.
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Brian - Windows 10 Home, 64-Bit, Version 1803, Build 17134 
     Explanations exist; they have existed for all time; there is always a well-known solution to every human problem — neat, plausible, and wrong.

          ~ H.L. Mencken, AKA The Sage of Baltimore