Scripting
Enable/Disable Plus Addressing

Enable or Disable Plus Addressing (Powershell)

I can't remember the last time I used this but it was very handy when I did need it.

Install-Module -Name ExchangeOnlineManagement Import-Module
ExchangeOnlineManagement Connect-ExchangeOnline -UserPrincipalName
<your.user@yourdomain.com> Set-OrganizationConfig
-AllowPlusAddressInRecipients <$true | $false> 

Note: Anything with in the <> greater/less than parentheses should be replaced with your filter parameters.