I want to migrate about 30 mail boxes over from a different mail solution to our shared hosting grommunio instance.
As the migration will take time, I'd like to create all the necessary mailboxes in grommunio several days in advance.
The target grommunio server is however a shared server with already several different tenants in production.
Of those tenants, probability is very high, that some of them would have mail exchange between them and the about to be migrated domain with its 30 mail boxes.
How do I tell grommunio to temporarily NOT deliver incoming mails into those mailboxes, but route them to the mx defined by dns?
