I have exchange 2003 installed on Windows Server 2003, and I have a Fedora Core 9 machine with nagios installed. I use nagios to send emails about server issues which has been working fine for years until today.
When an email is sent from my fedora box I get the following error.
550 5.7.1 x.x.x.x has been blocked by Spamhaus XBL
Now I assume the IP address of my fedora box has been marked by Spamhaus as Spam. Apart from moving nagios to a different IP is there any way of getting emails through. Is there a way of bypassing Spamhaus for this one ip address?
Any help on this issue is very gratefully received.