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After working OK, now unable to send email using Windows Live Mail on Windows 7

Last response: in Windows 7
November 21, 2013 2:50:58 AM

Error message :-
The message could not be sent because the server rejected the sender's email address.
Server error 555
Windows Live Mail Error ID:0x800ccc78
Protocol SMTP
Port 25
Secure(SSL): No
November 21, 2013 2:59:15 AM

you have been blacklisted for sending spam. (even if you haven't sent spam personally) it happens sometimes. Has your account been hacked recently by chance?