Hijacked domain.

This is slighly different to your normal support queries as the problem does not exist on any of my PCs.

I started getting emails this morning about every 2-4 mins. They are subjects like undeliverable message or returned mail. The message is a spam message which was never sent from any of my PCs. The original message shows that it was from xyz@pcconsultancy.com where xyz is a random set of letters and pcconsultancy.com is my domain name. It would seem someone, somewhere is sending a bulk spam mailing with the from part of the message using xyz@pcconsultancy.com and the rejected/returned messages are coming back to me.

Has anyone experienced this type of problem before? Does anyone know where on the web I can find details of this problem or how to decipher an email to establish where it came from originally. If I can get an IP address maybe I can find a way to stop the mails being sent at their source.

Ideas and suggestions would be greatfully accepted as the mailbox is filling up by the second.

Jules

 

http://www.dnsreport.com/tools/dnsreport.ch?domain=pcconsultancy.com+

I would start with an spf record first.