I have a couple of users whiose emails have been bouncing for a while. Since I happen to know their active emails, I went ahead as admin and changed their email address via their account settings. It worked fine for two of them (I clicked “show email”, then clicked the edit 
, entered the new email address, saved, and got a message that a verification email has been sent.) but with the remaining few, clicking on the edit immediately generates the message about the verification email having been sent (but according to the logs, no email has been sent). Never mind the faulty message, but I can’t edit the email field any more… Not sure, but this looks like a bug to me.
BTW, I am aware that I can change their email address via CLI without verification, but at this point I prefer them actually confirming the new email.