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exchange email distribution list error




Senders were getting an error in the diagnostic message, when sending emails to a distribution list that I was part of. The error is as follows :-

#550 5.7.1 RESOLVER.RST.AuthRequired; authentication required ##

So basically, no distribution lists would work. Sad

This started happening, after I changed a reverse DNS entry on the Domain Controller, so that it would reflect on the current smtp server.

To rectify the distribution list issue, I did the following in the Exchange COnsole :-


1. Go to the any of the Distribution List’s Properties.
2. Click on the Mail Flow Settings tab.
3. Double-click Message Delivery Restrictions.
4. Uncheck the box “Require that all senders are authenticated.” Cool

THe Sender should now be able to send to the Distribution Lists. Laughing



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