[Users] When replying, how is the To address chosen?

[Ralf Mardorf]

On Wed, 13 May 2020 16:34:55 +0100, Adrian wrote:
>I have unticked "Reply button invokes mailing list reply" and it has
>changed the behaviour to what I want.

Actually Paul's reply to take a look at the real headers was the best
idea. Anyway, while I changed my guessing/understanding, it's good to
hear, that you found out what of my guessing solves you problem.