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550 5.4.1 Recipient Address Rejected
I have some o365 users who have had name changes. These accounts are now refusing to receive emails from ONPREM users with the following error “550 5.4.1 Recipient Address Rejected”. I have found the...
I assume the users are synced from On-premise. It this is correct then you will need to look at the user's exchange attributes on-premise. The SMTP address would be stored in the users AD Attributes, so open the user up and see they have for proxyAddress. One thing would be to update the proxy address to include both the new and the old address. Then ADConnect replication will push the changes to AzureAD.
Cheers
Craig