Tenant admins can now use the Remove-DkimSigningConfig cmdlet in Exchange Online PowerShell (v3.7) to remove obsolete DKIM configurations without Microsoft support. This feature is available worldwide by June 2025 and requires appropriate roles and module updates for self-managed DKIM cleanup.
Applies to: Exchange Online · Microsoft 365 suite · Microsoft Defender XDR
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).