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Sharepoint and Exchange Distrubution Lists requiring authentication

Posted By:      Posted Date: October 12, 2010    Points: 0   Category :SharePoint


We have a Sharepoint 2007 environment and Exchange 2003.  We use SharePoint to send email to different distribution lists within Exchange.

When we send email from Sharepoint to a distribution list that does NOT have the "From authenticated users only" option checked in the Exchange General Tab of the group, email is received without a problem.

However, when email is send from Sharepoint with the "From authenticated users only" checked, email never comes through.

I assume this is because Sharepoint is not authenticating before it sends email via SMTP.

I gave the IP address of the Sharepoint server the ability to relay through our Exchange server, but that did not solve the problem. 

Do I need to specify authentication settings elsewhere on the SharePoint server?  I did not see anywhere within the Sharepoint Central admin to do so.  Do I need to adjust the settings on the SMTP server section within IIS? 


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