I received this message on gmail. I was sending an email to [email protected] from my personal gmail account. The message hasn’t been delivered to [email protected] however the emails I send from [email protected] have been successfully delivered to my personal gmail account. In other words I can send mails from the server but I cannot receive them.You have to login to the outgoing mail server to be able to send mail through it. If you see "Relay access denied" you have not logged in properly.