I have got the same problem.
But I don't believe the two answers above deal with the original question. And the various pages on the VM website are contradictory, presumably some of the into is out of date.
The problem is that if "every additional email address has its own MYVM account", we have no way of accessing that one because in the situation all the members complaining are in,
(a) we have never set up a "third party address",
(b) we have lost the password to access the mailbox directly,
and (c) the main MYVM account only allows you to look at or delete the mailbox names, not to request a password change or specify a "third party address".
