Commands › Exchange Online

Set-PerimeterConfig

Exchange Online ExchangeOnlineManagement Set-*

Modify the list of gateway server IP addresses that have been added to the cloud-based safelists.

Quick start script

# Set-PerimeterConfig — quick start (serv365.ai)
# 1. Connect (app-only shown; interactive: omit the certificate parameters)
Connect-ExchangeOnline -CertificateThumbprint $thumb -AppId $appId -Organization $org

# 2. Capture the current state first — you cannot roll back what you never recorded
$before = Get-PerimeterConfig
$before | Format-List

# 3. Make the change (dry run first)
Set-PerimeterConfig  -WhatIf
Set-PerimeterConfig

# 4. Verify and diff
$after = Get-PerimeterConfig
Compare-Object ($before | Out-String) ($after | Out-String)

Syntax

Set-PerimeterConfig [[-Identity] <OrganizationIdParameter>]
 [-Confirm]
 [-GatewayIPAddresses <MultiValuedProperty>]
 [-WhatIf]
 [<CommonParameters>]

Parameters (4)

Parameter	Type	What it controls
-Identity	OrganizationIdParameter	This parameter is reserved for internal Microsoft use.
-Confirm	SwitchParameter	The Confirm switch specifies whether to show or hide the confirmation prompt. How this switch affects the cmdlet depends on whether the cmdlet requires confirmation before proceeding.
-GatewayIPAddresses	MultiValuedProperty	Use the GatewayIPAddresses parameter to create or modify a list of gateway server IP addresses to add to IP safelists. IP addresses are specified in IPv4 format, for example, 10.1.1.1. If you list more than one IP...
-WhatIf	SwitchParameter	The WhatIf switch shows what the command does without making any changes. You don't need to specify a value with this switch.

Reference facts derived from Microsoft documentation, © Microsoft, licensed CC BY 4.0; restructured with original guidance by serv365.ai.