[Exim] How to thaw from the exim command line?

I am running exim 3.11 on a headless Sun Sparc box (Solaris 2.6) and have
no way to run eximon. I have a bunch of frozen messages from a mishap.

I have done an exim -bp and gotten a list of frozen messages. I have
then gotten the message ID's out of the list and fed them as arguments
to exim -Mt. That reports they are no longer frozen, but running exim -bp
again says that they are still frozen. I have also tried exim with different
-qf options. That just seems to hang. Am I doing something wrong or is
something broken here?

--Matthew