Thanks for your replies. I will try the first macro.
CJK → that looks like you have highlighted the text to get that contextual menu (?) I have just been right-clicking on the email itself which brings up this menu screenshot:
Nope, I just did a plain right-click, which then automatically selects the email address. It must be a limitation in the specific program you’re using, because otherwise, the feature I showed you is pretty standard systemwide.