So, I commented them out of the M5 code that I built a few days ago (not sure if they're still there in the new binary release). Anyway, the server appears to be working fine without them. From what I can tell, these were used in the M3 release, but not any longer. They have been replaced with "localMail" and "remoteMail" queues.
If that's not correct, please correct me. Otherwise, I answered my own question.
I believe that is correct.