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: <local-part>+<tag>@<domain>. For example, sean+newsletter@contoso.com.

Microsoft Docs

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.