How to enable Plus Addressing in Exchange Online

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One of the Exchange-related announcements from this week’s Microsoft Ignite 2020, was that Exchange Online now supports Plus Addressing, also known as “sub addressing”, “+ address” or “dynamic email aliasing”. It is a long-awaiting feature by many and it is now available in all tenants.

So What is Plus Address ?

Plus addressing allows you to add a suffix to the local-part of your email address to create a dynamic child address or disposable address which you can use as your email address.

An example:

  • The standard address is: andrew@contoso.com
  • The Special Plus Address could be: andrew+msdigest@contoso.com

Now, when Andrew signs up for the msdigest.net newsletter, he can use the special address, andrew+msdigest@contoso.com to sign up, instead of his standard email address.

He can then use it to create an Inbox rule to route all messages sent to this + address (andrew+msdigest@contoso.com) to a folder of his choice.

It’s a great way to more easily manage your Inbox, track marketing or sales campaigns, and even help you identify when an address that has been signed up to a newsletter, etc, might have been accidentally leaked or even sold.

How to Enable Plus Addressing in Exchange Online

Plus Addressing is supported in Exchange Online and not available in any Exchange on-premise versions.

It is enabled on the organization level, using PowerShell. First, connect to Exchange Online using PowerShell.

When connected – you can check the current settings for Plus Addressing using:

Get-OrganizationConfig | Select AllowPlusAddressInRecipients

Enable Plus Addressing by setting AllowPlusAddressInRecipients to True, using this command:

Set-OrganizationConfig -AllowPlusAddressInRecipients $true

It is now enabled and available for all your end users in the tenant, so they can use the Plus Addressing feature.

Check out the Exchange session by Greg Taylor from Ignite 2020: