Forcing carbonio to send all outgoing mails from other carbonio domains mail to one specific carbonio domain to an external relay mta

I am moving one specific domain from my single server multi-domain carbonio mail server to another mail server using imapcopy.

I (and my users from that domain) want to keep their mail account, until they are assured, that all mail has been moved to the new external mail server.

But I want all mail sent to this exported domain from other users on my mail server to be relayed to the other external mail server.

I have tried "zmprov md monrad.dk zimbraMailStatus disabled zimbraDomainStatus; zmcontrol restart" , but it does not seem to have the wanted effect.

It seems to only disable local delivery, not to disable the "existence" of the domain and route external.

All advice will be appreciated.

/ Harald