Hello How can I restrict one user from Active directoryfrom sending/receiving emails to several addresses at the domain of @theprobegroup.com.au? Thank you in advance. pwint

If your running 07 for your hub transport/all your outbound mail is going through 07, create hub transport rules to silently drop or NDR the messages. The mailboxes don't have to be on 07, but 07 has to do the mailflow.