| Event Id | 3017 |
| Source | MSExchangeActiveSyncNotify |
| Description | A non-delivery report with a status code of number was generated for recipient address (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 looping condition. This typically indicates that the server is configured to route mail back to itself. Resolution : Check the configuration of the virtual server??s connectors for loops and ensure each virtual server is defined by a unique incoming port. User Action : If you have multiple SMTP virtual servers configured on your Exchange server, make sure that they are configured with a unique incoming port and that the outgoing SMTP port configuration is valid. Make sure that all of the connectors are correctly configured. For example, make sure that no connectors have the address space of the local organization, unless you share the domain, and that you do not select Use DNS to route to each address space on this connector. |
| Reference Links | A non-delivery report with a status code of number was generated for recipient address (Message-ID message id). How to configure the SMTP connector in Exchange 200x When to create SMTP connectors in Exchange 2000 and later How to Configure a SMTP Virtual Server Part 1 |
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