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Tag Archives: Exchange 2013

Video: Exchange 2013 – Custom Receive HubTransport Connector Problem

The problem occurs when you choose the “HubTransport role” for the connector type. In this case, the Default Frontend connector, which is the common messaging entry point for the organization, closes connections from remote email servers with “421 4.3.2 Service not available” and effectively rejects accepting inbound e-mails.

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