Event ID - 6015

Event Id6015
DescriptionCategorizer is NDRing a recipient with address SMTP:Administrator@contoso.com with reason code 0xc00402de (The sender does not have the permissions required to send this message to the intended recipients. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Event InformationAccording to Microsoft:
To turn on maximum logging of the MSExchangeTransport event source, follow these steps:
1. In Exchange System Manager, expand Servers, right-click the Exchange computer name where you want to configure logging, and then click Properties.
2. Click the Diagnostics Logging tab.
3. In the Services pane, click MSExchangeTransport.
4. In the Categories pane, click a category, and then click Maximum.
5. Repeat step 4 for each category.
6. Click OK when you are finished.
Reference LinksHow to restrict the users who can send inbound Internet e-mail to another user or to a distribution group in Exchange 2003

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