Forum Discussion
Local domain mailbox migration error
I ran into an issue while migrating from on-premise to O365. On-premise AD domain is “domain.local” so users have their mailboxes smtp address as follows: primary smtp mailto:email address removed ...
That happens because domain.local aliases are syncing to O365, but O365 doesn’t accept non-routable domains. You’ll need to remove or filter out the *.local proxy addresses from AD/Azure AD sync before migrating, leaving only valid routable SMTP domains.