The Admin module for newsletters is not sending out emails to the selected user roles or additional emails. The bulkmail report states that "There is a problem with the configuration of your SMTP Server. Mail was not sent."

The SMTP test in the Host->Host Settings tab indicates that the SMTP server is set up correctly (the host email gets a confirmation email on the SMTP test). Additionally, outside of DNN I can log into my host server and send emails using my host email client and email account.

Anyone have any ideas on what the problem is?

Solved.  I needed to flush cache and restart application.