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Use the new Exchange admin center to disable or anable plus addressing

• In the new Exchange admin center at https://admin.exchange.microsoft.com, go to Settings > Mail flow.
• Select Turn off plus addressing for your organization, and then select Save.

Use Exchange Online PowerShell to disable plus addressing

• Connect to Exchange Online PowerShell.

The command uses the following syntax:

Set-OrganizationConfig -DisablePlusAddressInRecipients <$true | $false>

To disable plus addressing in your organization, run the following command:

Set-OrganizationConfig -DisablePlusAddressInRecipients $true

To enable plus addressing in your organization, run the following command:

Set-OrganizationConfig -DisablePlusAddressInRecipients $false

You can add a mailadresse to the admin account at the user settings. If the mail account already exists in Azure, you can use a “+” to the mail address to allow Azure to add the address.

E.g.

[email protected]

Exchange online will ignore everything on the right side of the plus sign.

“https://blog.sonnes.cloud/azure-ad-admin-and-use-of-pim-email-forwarding-for-your-admin-accounts-notifications/”

Due to Hybrid Mode enabled , I had to create Mailflow Rules to forward +admin to the normal user accounts