In this blog post I will provide the neccessary commands to configure + addressing in Exchange Online. According to Microsoft, plus addressing can be described as an alternative to E-Mail aliases.
From September 2020, plus addressing, also known as subaddressing, is available in Exchange Online. Subaddressing is a defined way to support dynamic, disposable recipient (not sender) email addresses for mailboxes.
Plus addressing uses the syntax:Microsoft Docs
<local-part>+<tag>@<domain>. For example, email@example.com.
First install the Exchange Online Module, if required, and connect to Exchange Online.
Install-Module ExchangeOnlineManagement -Force -AllowClobber Connect-ExchangeOnline
Next, run these two commands to configure plus addressing and to check if this worked.
Set-OrganizationConfig -AllowPlusAddressInRecipients $true Get-OrganizationConfig | Select-Object *Allow*
From now on, plus addressing is configured and users can start using these plus addresses as an alterative to their main e-mail address.