DotNetNuke, ASP.NET, Web Development Blog

Determine if SmarterMail 16+ is being used as an open relay

Look at Reports -> Message Traffic. Look at the total number of messages being sent  under Trend mode. Then switch to Domain mode and verify the numbers are similar. 

Search your Delivery Logs (Manage -> Troubleshooting -> View Logs) for "Sending remote mail" and verify all the email addresses involved are valid for your server. 

Check your Spool - you may have a bunch of emails trying to go to invalid email addresses.

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