Error while trying to configure Automatic Reporting

Hi,

I get the following error while configuring automatic reporting to send the monthly usage report to the VSPP business portal.

Error creating or sending the monthly usage report TEST to the VSPP Business Portal: javax.mail.SendFailedException: Invalid Addresses; nested exception is: com.sun.mail.smtp.SMTPAddressFailedException: 550 #5.1.0 Address rejected.

I believe my SMTP and firewall rules are not at cause since I can generate test emails alerts from the Manage->Email section. I'm using version 3.3.1.

Please advise,

Thanks

Alex