| Event Id | 3020 |
| Source | MSExchangeActiveSyncNotify |
| Description | A non-delivery report with a status code of number was generated for recipient recipient (Message-ID message id). |
| Event Information | According to Microsoft: Cause: This Error event is logged when a non-delivery report (NDR) is generated because of a detected message loop. This event can also be logged if a contact object exists in one organizational unit (OU) that has the same e-mail address as a user in another OU. User Action : Verify that you do not have a user in one OU and a contact in another OU that have the same e-mail address. |
| Reference Links | A non-delivery report with a status code of number was generated for recipient recipient (Message-ID message id). |
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