After using Transfer Tool from server-A to server-B, all remote MX DNS entries got "auto-merged" (converted) to local MX on server-B and the original line sits in a comment on the WHM Edit DNS Zone form. Now I have to manually adjust a ton of domain zones by hand and some customers might even have lost email because of this! Why is WHM 72.0 doing this?! I double checked that the MX was on REMOTE on server-A before transfering (not on automatic, because I had the feeling this could go wrong) and it really was/is on REMOTE, so there's no excuse for this happening. This looks like a (very important) bug to me.