Event ID - 2446

Event Id2446
DescriptionMS Mail Connector Interchange has failed processing message from Exchange. The message is left in the delivery queue. Use the MS Exchange Administrator to view the details for this message or remove it from the queue. This message entitled "<message subject>" is from <message sender>. This error message will be logged again the next time MS Connector is restarted if the message is not removed from the queue.
Event InformationAccording to Microsoft:

These symptoms occur when you receive a message by means of the Internet Mail Connector that contains a REPLY-TO address that cannot be understood by the Microsoft Mail Connector.
Microsoft has confirmed this to be a problem in Microsoft Exchange Server 4.0. This problem was corrected in the latest Microsoft Exchange 4.0 U.S. Service Pack.Download and install the exchange server 4.0 latest service pack.
Reference LinksMSExchangeMSMI Reports Event IDs 2380 and 2446/2447

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