- You have a hybrid deployment of on-premises Microsoft Exchange Server and Exchange Online.
- You configured the outbound send connector in Exchange Online to use a remote domain of "*", and you enabled centralized mail transport on that connector.
- A user or application in the on-premises organization sends an email message to a mailbox that's hosted in Exchange Online, for example, email@example.com. And the Exchange Online recipient, firstname.lastname@example.org, has a forwarding SMTP address that's set to an external recipient (email@example.com).
Still need help? Go to Microsoft Community or the Exchange TechNet Forums.
Article ID: 3194415 - Last Review: Jan 13, 2017 - Revision: 1