Hello
I'm very very new to using WHM. I've got a client for who I made an account for. He has a couple of paid mailboxes with his domain registrar (not me).
When I change the nameservers of his existing domain, those mailboxes will no longer work (correct?).
I've had this problem once before but then I worked with a third-party hosting company so they resolved that problem.
I know it has something to do with the MX records (edit DNS zone?) but like I said, I am new to all of this so I don't touch anything unless I know what it will do
