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
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.
Exchange online will ignore everything on the right side of the plus sign.
Due to Hybrid Mode enabled , I had to create Mailflow Rules to forward +admin to the normal user accounts