Unable to send emails from Windows Live Mail 2011 on Windows 7- only in last few weeks. Comes up with this message:

The message could not be sent. The setting for your outgoing email [SMTP] server might need to be configured. To find the server settings for '...@...com.au', please contact your email service provider.

Subject -------
Server Error: 451
Server Response: 451 https://www.spamhaus.org/query/ip/1.132.8.244
Server: -----
Windows Live Mail Error ID: 0x800CCC79
Protocol: SMTP
Port: 25
Secure(SSL): No

Just trying to 'repair all WLE programs' as I found online as one thing to do.  Said lost internet connection and Cancel/retry. trying to retry but just seems to sit there at the moment even though I have been able to go to this page? Any ideas?

P.S.   Also changed port to 587 as found on web...still same result, just different server error