I wrote
: On one of my lists, a user tried to "unsub" but was told by Listserv that he
: is not subscribed.
:
: As listowner, how can I see who the concealed users are? He thinks he
: might (inadvertently) be one of them, though this sounds unlikely to me.
It turns out that he was indeed one of the concealed users.
Thanks to all who responded.
-_Andy