Office 365 used one of your organization's connectors to send the message to an external address. An admin in your organization ...

Office 365 used one of your organization's connectors to send the message to an external address. An admin in your organization set up a mail flow rule to route messages through that connector. Here are the details:

Connector name: {0}
External address: {1}
Destination IP: {2}
Destination smart host: {3}
Mail flow rule: {4}