Split from this thread.

Hi Firedog,

I also have this similar error try to get this help for a week already. Please have look for error msg

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.live.com'
Windows Live Mail Error ID: 0x800CCC78
Protocol: SMTP
Port: 587
Secure(SSL): Yes

Incoming server is ok but not outgoing server. Please share for any help in this issue.

Thank you.

Regards,

Nick