I've successfully setup the Smarthost SMTP relay under the IIS admin settings and tested sending messages from my Unity Connection server to the Smarthost via telnet and the Windows CLI. Messages sent via the CLI arrive no problems.
However, SMTP notifications still do not work. I have a test user with the "enable" checkbox checked for SMTP notification. When testing, I don't even see an attempt to send a mail message in the SMTP service logs.
What can I do to get Unity Connection to send the SMTP notification?