Typically, this error means Microsoft 365 tried to connect to the smart host that's specified in the connector, but the DNS query to find the smart host's IP addresses failed. Collectively, queuing and notification errors for undeliverable messages sent via connectors is known as mail flow intelligence. The most common errors and their solutions are described in this article. Microsoft 365 generates an error when a message can't be delivered by using a connector. After 24 hours, the queued message will expire, and the message will be returned to the original sender in a non-delivery report (also known as an NDR or bounce message). Microsoft 365 will continue to retry delivery for each message for 24 hours. When Microsoft 365 can't deliver these messages via the connector, they're queued in Microsoft 365. You might also use a connector to route messages from Microsoft 365 to a partner organization. In Microsoft 365 organizations with mailboxes in Exchange Online or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, you typically use a connector to route email messages from EOP to your on-premises email environment. Microsoft Defender for Office 365 plan 1 and plan 2.Learn about who can sign up and trial terms here. Did you know you can try the features in Microsoft 365 Defender for Office 365 Plan 2 for free? Use the 90-day Defender for Office 365 trial at the Microsoft 365 Defender portal trials hub.
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