Updating Email Addresses After Removing Domains from a Microsoft 365 Tenant

Microsoft 365 makes it easy to remove domains. However, if you remove a domain and don’t adjust email proxy addresses, some fix-up might be needed to make sure that mail-enabled objects don’t have primary SMTP addresses or proxy addresses that use the removed domains. This article explains how to fix up mail-enabled objects with PowerShell to remove traces of any removed domains.

https://office365itpros.com/2025/03/19/remove-domain-adjust-addresses/