The preferred procedure in a case like this would be to change your
Send= setting temporarily to

* Send= Editor,Hold

and define an editor, eg,

* Editor= [log in to unmask]

Then free the list.  Everything currently held will come to you for
approval.  Just OK the messages that should go through and discard
the ones from the mail loop.  Once you clear the queue you can set
your Send= setting back to whatever it was before.

You could alternately set the user in question to REVIEW or even
NOPOST before freeing the list and only his postings would show up for
review or be rejected altogether, while everything else would just be
processed normally.  This might be simpler, it depends on whether or
not you want to make sure you want to check <everything> that is
currently enqueued before letting it through.  That's sometimes
useful in case people have been writing in with "What's going on?"
messages--you can just dump them too if you make everything go through
the confirmation process with the preferred procedure above.

Nathan