Hello,
We are trying to use D365 Service module as internal HelpDesk system. Some parts of the systems we have done successfully but with emails isn't easy. The problem is that messages are tracked several times, for example a user John sends a service request to service mailbox and service mailbox answers him with standard reply that a case for his problem was created but CRM smart matching find this email in John mailbox and tracks it (one is sent by system to John and second is received by John from system) so eventually we have repeating emails like this.