There has been an update to Plus addressing in Exchange online.
- Plus adressing will be enabled by default starting from 17. April 2022
- If you wish to Opt-Out of Plus Adressing you will need to use this command
Set-OrganizationConfig -DisablePlusAddressInRecipients $true
Plus Addressing in Exchange Online
If you want to check your current Recipients for Plus addresses you can use my Script from GitHub
You can review your Exchange Online Settings in your tenant with the following Command
Get-OrganizationConfig | fl *plus
In the Exchange Admin Center there is also a new Setting under "Settings > Mail flow"