This indicates that the remote server requires authentication in order to allow you to send mail. The MEG is currently unable to do SMTP Authentication. If this is a feature that you require, please submit a PER (https://kc.mcafee.com/corporate/index?page=content&id=KB60021). If this is an external domain to whom you are intending to send mail, please contact their mail admins to get allowed to send them mail.
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