Investigating a SPAM problem?

I seem to be the victim of a SPAM Attack. It seems that un-solicited email is being sent from addresses associated to this site, despite being the owner/ administrator for this domain, I am not reponsible for this SPAM.

I am currently investigating ways of dealing with this problem but have not yet discovered a solution. I have not been able to identify a single source (IP address) for this SPAM at this time, it seems to be coming from a variety of sources and email addresses of the form ****_at_wombatz.co.uk. There are a range of topics and attacments to these emails, some of which are completely incoherent. They are not due to a virus on my machines as the first messages seem to have been sent out whilst my machines were all turned off. The messages are not being sent to email addresses that have any connection with me or my on- line activities. One suggestion is that this is a so-called Joe Job. I am not aware of having done anything to provoke this activity.

Follow this link to read more about Joe Jobs and the only possible ways of dealing with them. This is a very discomforting and inconvenient experience, and I ask for your understanding in this matter.

I can only apologise for any inconvenience this may have caused you through unsolicited email, but please believe me when I say that I am in no way responsible for this activity. I hope that this ceases soon.