Hi Michael,

 

Have you had a chance to review your SmarterMail logs for more information? Your SMTP and Delivery logs would be good to reviewing messages coming and going from your server. Just be sure your log levels are set to detailed, and when searching, select the option to "Display related traffic". Check out some more information here on Tracing Messages from an Email Account in SmarterMail, and let me know if you have any questions.

 

Thanks!