[EXIM] Unfreezing Messages

Hello all......I have half of the answer to my question and I am probably missing
the other part in the docs, but I was unable to find it. A listserv that is
running is not managed well, and is getting a lot of bad messages that become
frozen, upwards of 100. I have been doing a -Mt for each, and have found the
auto_thaw option for the config file, but not sure of the syntax after the option.
Thanks for the help once again....
Paul Yahnig