On Wed, Dec 2, 2020 at 06:38 PM, Gene wrote:

But is a reply to sender link available in e-mail programs on lists where the address is hidden?

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I have no idea.  I have never dealt with an e-mail list where e-mail addresses are hidden such that you cannot reply privately if you so choose.

But even if such exist, they're irrelevant to discussions regarding Groups.io, and the Reply to Sender link, which is provided on every message that goes out.  This conversation has a clearly defined scope, and I'm not trying to expand beyond it.
 
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Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042  

If you think that you can think about a thing, inextricably attached to something else, without thinking of the thing it is attached to, then you have a legal mind.

        ~ Thomas Reed Powell