Removing 'accept all' for non-subscribed user in mailman?

[Kurt Granroth]

I have a few lists in which people are subscribed primarily by a 
redirecting email address.  Since they typically post using whatever 
physical address they are using at the time, I get a 'moderation 
request' the first time they post using that address.  I then mark that 
address as 'accept all' and that's it.

One of the list members just had one of her physical addresses 
compromised, though, and it's sending SPAM to the list.  My question is: 
how do I revoke the 'accept all' on that address?

The mailman interface seems to only deal with the actual subscribed 
addresses.  Is there a command line interface or config file or somesuch 
that can deal with *all* addresses?

Kurt