To prevent junk email from being sent to these lists, in your email program add a listing entitled 000AAA. For an email address use aaa@aaa.aaa.If spyware or a virus gets into your computer, it will try and email your whole email list. It will hit this, which will bounce as undeliverable and stop. Also you will get an error message to warn you of the problem, so you can make repairs. I am subscribed to all three lists, just in case they get hit with junk email and have instructed everyone at the Vatican In Exile how to avoid this problem. 
