Split from this thread.
I have same problem.
Live Mail Version 2012 Build 16.4.3528.0331
Windows 10 Pro Version 1607 (OS build 14393.969)
Following error trying to send mail. I can receive mail although slowly.
The message could not be sent because the server rejected the sender's email address. The sender's email address was *** Email address is removed for privacy ***'.
Subject 'test'
Server Error: 550
Server Response: 550 5.7.3 Requested action aborted; user not authenticated
Server: 'smtp-mail.outlook.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): Yes
Server Error: 550
Server Response: 550 5.7.3 Requested action aborted; user not authenticated
Server: 'smtp-mail.outlook.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): Yes
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