By the way, the Reply to Sender link, which is simply using click-through text for a mailto: link, is 100% correct.  If it sticks trying to use it directly, regardless of the email client or webmail, try bringing up the context menu once it has focus and the correct email address of the sender is always part of that mailto link.

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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