Web Reports. Failed sending data to the peer

Hello

I’m trying to setup a report to be sending by email from Web Reports, I have verified theres communication between WR and SMTP relay, also authentication for the SMTP relay is no required, but I keep getting the following error message:

Error sending test email: An error occurred while sending the email: Failed sending data to the peer

Any idea, have someone faced the same issue?
Any help will be appreciated.

Did you ever figure this out? I have the same problem.
Is there any more logging than can be enabled for WebReports to identify an error code?