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FIX IT: Outlook POP3 Server error: ‘550 5.7.1 Unable to relay’

June 23, 2011 By Damitha Anuradha Leave a Comment

If you are getting ‘550 5.7.1 Unable to relay’ in outlook you can fix it by changing Authentication settings in internet(Default) receive connector.


Change the settings as follows:


In outlook select the “Use same settings as my incoming mail server” under “My outgoing server (SMTP) requires authentication”

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