Have you checked this thread: E-mail notification problems to Gmail ?
Of course, as the developer of duplicati-monitoring.com , I have to mention that the easiest way to get Duplicati reports by email is our service 
Have you checked this thread: E-mail notification problems to Gmail ?
Of course, as the developer of duplicati-monitoring.com , I have to mention that the easiest way to get Duplicati reports by email is our service