Able to recieve emails but unable to send via outlook and getting error message "Recipient(s) cannot be reached - 550 SMTP Relay Scanner failed"

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My colleague all of sudden is unable to send emails from his laptop however he is able to send from blackberry, once he try to send email from outlook (laptop) he get this message:

The following recipient(s) cannot be reached:

[email protected] on 21-Nov-11 7:37 PM
550 SMTP Relay Scanner failed
Tim S.

Thanks for posting your question. I'm more than happy to assist you today. We're looking into the issue now for you. This appears to be a bounce back message. Is this an error message you are getting in Outlook? Can you respond back with the full email bounce back message?

If you need further assistance please feel free to contact us!

Thank you!

Tim S