Hi Charlie et al,
My apologies for not giving a lot of detailed info on this originally - I wasn't as focused on the problem as I should've been when I typed up the message.
If you have a digest list connected to it, remove it temporarily.
I did this and messages are being sent now. I also found that I'd turned on digesting in rc.init, instead of the rc.custom for the list I wanted a digest list for, which was throwing off the other production list as well as my test list.
I'm going to play with this more tonight, when I can better concentrate on it and I'm not on company time, and see if I can resolve it now that I've got a direction to go in.
Steve (Who normally is much more detailed in his descriptions of technical problems, and who also thanks Charlie for his help! :)