[MlMt] Why do MM list messages end up in the junk folder?

[Dave C]

With regularity, messages from this list are going to the junk mailbox. 
I have to select them and choose “move out of junk” and they show up 
in the MM mailbox.

By what mechanism is junk status determined and how to modify this so as 
to leave MM messages alone?

I am not using SpamSieve. Maybe sometime, but I’m still trialing…

Thanks,
Dave