from NEWS.html: Changes in version 0.97 ... Removed the vcheckquota and vpopbull tools that are now part of the vmailmgr-tools package.
vmailmgr-tools depend on vmailmgr, not the other way around. All I can do is adding a postinst message. Care to post here a warning proposal?
I've added a warning about moved utilities in postinst function.