Hi I am using Windows Live Mail and as of yesterday, I cannot send any emails but can still recieve.  The message I get is as follows;

An unknown error has occurred.

Subject 'neo'
Server Error: 554
Server Response: 554 nskntcmgw07p BigPond Outbound [OB105. Connection refused. 121.219.230.47 is listed on the Exploits Block List (XBL). Please visit http://www.spamhaus.org/xbl/ for more information.
Server: 'mail.bigpond.com'
Windows Live Mail Error ID: 0x800CCC6F
Protocol: SMTP
Port: 25
Secure(SSL): No

Can any one help me?  I have been on the spamhaus website and followed some instructions, but as far as I can tell the above IP address is not mine.

Thanks in advance!!

Hi all, 
I'm looking for any assistance with this problem i'm having. Recently i purchased a Mac and am using Outlook and it has been working perfectly until yesterday when i received the following error message: 

nskntcmgw08p BigPond Outbound [OB105. Connection refused. 121.212.3.200 is listed on the Exploits Block List (XBL). Please visit http://www.spamhaus.org/xbl/ for more information.

As I have always used Windows and have always had an Internet Security software program on my computer I am at a loss as to what this issue is and I don't know anything about this 'spamhaus' website.

Can anyone please assist?  Any feedback would be very much appreciated :)

Cheers,
Anita