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Server error 550

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Older post from December 7, 2016. Details may be out of date.

Question asked on Dec 7, 2016
I can receive emails, but can't send due to the server rejected the senders email address. Server error 550. Server Response 550 5.1.0 Authentication required.

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Server error 550, error ID 0x800CCC69Jul 8, 2016 Windows Live Mail Server Error: 550, Error Number: 0x800CCC69Jul 31, 2014 The message could not be sent with smtp.live.com, Server Response: 550 5.7.3 Requested action aborted; user not authenticatedSep 14, 2016