Hi,
1. The error from the STAX window, "ValueError: too many values to unpack" can be traced to your maildomain name. The error is almost certainly due to the fact that your maildomain, which you specify as "WIN-0FBCUBV1XIX" in your VMMARK2.CONFIG, includes the character "-".
First, we should check the actual maildomain name.
On your Mailserver VM, go to "Start" > "Control Panel" > "System".
What is the "Full computer name" as listed on the system page?
2. Yes, you do need to set passwordless SSH for all servers in your VMmark cluster.
Thank you,
Rebecca