After the Ipswitch Exchange Transport Rule is enabled, Exchange Incident Reports are placed into the Ipswitch Analytics Exchange Mailbox. The volume of Exchange Incident Reports depends on your Exchange Transport Rule conditions and the volume of emails that match these conditions.
To shut off this flow, disable the Ipswitch Analytics Transport Rule. If you have created multiple Ipswitch Analytics Transport Rules to supply multiple Ipswitch Analytics Exchange Mailboxes, disable all of them.
Reference: Microsoft TechNet
Disable-TransportRule "IpswitchAnalyticsTransportRule"
Get-TransportRule | Format-Table Name,State
Example: The figure shows the disabled status of the Ipswitch Analytics Transport Rule.