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|c# Office365 SMTP Exception received 5.7.1 Client was not authenticated||4||308|
|second athoritative domain||17||208|
|Recommended Free/Open Source E-mail Encryption||4||56|
|Mailbox unavailable. The server response was: 5.7.1 Unable to relay - Sending email to Exchange HT/CAS behind Windows NLB||7||89|
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