After working OK, now unable to send email using Windows Live Mail on Windows 7
Error message :- The message could not be sent because the server rejected the sender's email address. Server error 555 server smtp.ntlworld.com Windows Live Mail Error ID:0x800ccc78 Protocol SMTP Port 25 Secure(SSL): No
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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?