Hi
Have you sorted as i am having the same issue.
I am speaking to there support but they haven't a clue. I have upgraded the firmware but still the same.
I know that all the settings are correct as i have a SMTP relay server at home and can connect and telnet from any other device so i know there is nothing wrong with the settings. I believe the issues is with the firmware but they wont accept just wondered if you had sorted your issue?
Ta