Enabling plus addressing/aliasing in Microsoft 365
Product: Exchange Online
Since this article was first written in December 2021 Microsoft has enabled plus addressing for all tenants. Therefore the original content from this article has been removed and replaced with instructions on disabling it.
This has been retested on Windows 11 running PowerShell 5.1
If you need to install and import the ExchangeOnlineManagement module:
Set-ExecutionPolicy Unrestricted
Install-Module -Name ExchangeOnlineManagement -Force
Import-Module -Name ExchangeOnlineManagement
Using an elevated Powershell / Powershell 7 prompt use:
Connect-ExchangeOnline
To disable plus addressing organisation-wide:
Set-OrganizationConfig -DisablePlusAddressInRecipients $true
Then disconnect from Exchange Online and set the execution policy back to restricted:
Disconnect-ExchangeOnline
Set-ExecutionPolicy Restricted
What is Plus Addressing
Plus addressing allows end-users to create additional email addresses on-demand, for a specific purpose or service.
For example [email protected] might want to use [email protected], when signing up to Facebook.