Hoping some can help me please. having an issue with windows live mail and in need of some assisstence please. An unknown error has occurred. and it wont let me post the error but ill type what is says,

Server Error: 554
Server Response: 554 nschwcmgw06p BigPond Outbound [OB105. Connection refused. 120.147.8.167 is listed on the exploits block list (XBL). Please visit hhtp://www.spamhaus.org/xbl/ for more information.
Server: 'mail.bigpond.com'
Windows Live Mail Error ID: 0x800CCC6F

Protocol: SMTP

Any help will be greatly appreciated.

Thank you