An error occurred while sending an email to the Exchange 2007 distribution group.

An error occurred while sending an email to the Exchange 2007 distribution group.

Create a distribution group in Exchange Server 2007, which also has a unique name, that is, the distribution group name. By sending an email to the contact group name, the system automatically delivers the email sent to the Contact Group. However, an error may occur when an email is sent using another email address outside the Exchange Server. The prompt message is:

#<#5.7.1 SMTP; 550 5.7.1 resolver. rst. authrequired; authentication required> # SMTP #

Cause: the external mail sender cannot pass the Exchange Server verification.

Solution:
#1. Click the distribution group name as you want to set
#1. Exchange Console: Configure recipients> distribution groups. Find the distribution group to be set.

#2. Click the "properties"
#2. Right-click "attribute" or click "attribute" on the right

#3. Click the "Mail Flow Settings" tab
#3. Select the mail flow Tab

#4. Click the "message delivery restrictions" item
#4. Right-click the transfer restriction item

#5. Click the "properties..." button
#5. Click "properties ".

#6. Uncheck the "require that all senders are authenticated" item
#6. deselect "require all senders to pass authentication"

#7. Click "OK" button
#7. Click "OK"

#8. Click "OK" button again
#8. Click "OK"

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