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Event ID: 1103 Source: MSexchangeDS

During intersite replication, the directory replication agent (DRA) received a non-delivery report (NDR) for messages submitted for the directory at %1. The diagnostic is %2. The reason is %3.
Microsoft article ME230497 has information about this event.

See the link to "EventID 1103 from source Active Directory" for additional information on this event.
As per Microsoft: "This issue can occur because Exchange Server 5.5 Service Pack 3 makes virus-scanning APIs available to speed up attachment scanning. Because of this, certain replication problems can occur if the replication messages contain attachments". See ME263710 for more details.

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