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Event ID: 4123 Source: MSExchangeIMC

Source
Level
Description
A message passing through the Internet Mail Service has been intentionally dropped. This is most likely an admin notification (message describing mail failure) and out of office notification (OOF), or an automatic reply from a user's mailbox. Dropping of OOF messages and automatic replies is configurable in the admin pages. The gateway must always drop notification to the administrator, since they often cause mail loops.
Comments
 
This problem can occur because, by default, the Internet Mail Service is set not to allow autoforwarded messages to external addresses. See ME278352 for a hotfix applicable to Microsoft Exchange Server 5.5.

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