Monday, February 10, 2014

550 5.7.1 RESOLVER.RST.AuthRequired; authentication required

Getting error when sending email to Distribution List
5.7.1 smtp;550 5.7.1 RESOLVER.RST.AuthRequired; authentication required> #SMTP#

When creating a new recipient or distribution group in the Exchange management console for Exchange, by default it will require that all senders are authenticated.

1.      Go to the Recipient Configuration
2.      Select Distribution Group
3.      Right Click on the Distribution Group then click on the Mail Flow Settings tab and   
        double-click the Message Delivery Restrictions option.
4.      Un check    “require that all senders are authenticated

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