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Set-PerimeterConfig

Use the Set-PerimeterConfig cmdlet to modify the list of gateway server IP addresses that have been added to the cloud-based safelists. Exchange PowerShell reference

From the Exchange PowerShell reference 4 parameters Its page in the reference

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Parameters

4 in the Exchange PowerShell reference
-IdentityThis parameter is reserved for internal Microsoft use.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-GatewayIPAddressesUse the GatewayIPAddresses parameter to create or modify a list of gateway server IP addresses to add to IP safelists.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.