[exim] Quick callout DB manipulation question

    I'm running Exim 4.52, and I was wondering if there's a way to 
manipulate the callout cache db?  In other words, what's the easiest way 
to remove a particular address from the callout cache DB so another 
delivery attempt to that address can be made immediately?  I've read 
through the Spec's and couldn't find it in there anywhere, but if I 
missed the answer in there, I apologize in advance.
Thanks much,