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Event ID: 4042 Source: MSExchangeIMC

A timeout occurred while trying to deliver mail to <ip address> (for <host name>). Undelivered mail will be  retried later. The timeout occurred while waiting for a response to the MAIL FROM command.
Possible cause: the message in the queue has expired. The sending server tried to relay or deliver the message but the action was not completed before the message expiration time occurred. This message can also indicate that a message header limit has been reached on a remote server or some other protocol timeout occurred while communicating with the remote server.

Troubleshooting: This message usually indicates an issue on the receiving server. Check the validity of the recipient address, and determine if the receiving server is configured to receive messages correctly. It may be necessary to reduce the number of recipients in the header of the message for the host to which you are receiving this error. If you resend the message, it is placed in the queue again. If the receiving server is up, the message is delivered.

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