I try to send and email throught Outlook but i got the error message "RELAY not allowed" why?

I try to send and email throught Outlook but i got the error message "RELAY not allowed" why?
Category : Email

	You have to enabled SMTP Authentication **Important - Always use this format username@domain.com as the mailbox username for your account. When setting up Outlook or Eudora, make sure to check on (highlight) my outgoing (SMTP) server requires authentication before sending


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