Hi,
we had similar issue when we have enabled server side sync of emails to dynamics.
Our users are added to the system as contacts as well, so if a user would e.g. change his personal settings -> email -> All email messages, this very likely would cause emails appearing in the system, which should not appear there.
We have defined for our company “Email Messages in response to Dynamics 365 email” as the default setting for all users.
So, we have created a flow which is triggered when a user changes his personal settings about tracking email messages, if the setting does not correspond to our defined default setting, we update the setting (back to our default)

1. we use DataVerse Connector “When a row is added, modified or deleted”:
• Change Type “Modified”
• Table Name “User Settings” (this is the table the settings are stored)
• Select Columns “incomingemailfilteringmethod” (to assure flow is only triggered when this is changed)

2. we use compose to check the value of the email setting
• Input = “Incoming Email Filtering Method” (@{triggerOutputs()?['body/incomingemailfilteringmethod']} ) from previous step

3. we get the system user which tried to change
This we use to send a notification to admins, with the corresponding user information
• Table Name: “User”
• Row ID: “SystemUserID” from step 1

4. we check if the setting is not our defined default settings
In our case default setting is “Email Messages in response to Dynamics 365 email”, which corresponds to value “1” of the option set “incomingemailfilteringmethod”. So we check if the new value does not equal “1” ( we use the output of step 2)

5. we reset the setting to our default value “Email Messages in response to Dynamics 365 email”
• Table: “User Settings”
• Row ID: “SystemUserId” (unique identifier of user settings table, retrieved from step 1)
• Incoming Email Filtering Method: “Email Messages in response to Dynamics 365 email”


In your case you can reset to "4", this should be "No email messages". But better check using the compose and set the value in your personal options to control.
Best regards,
Ralph