Regarding spam email from this domain

Please note that if you have recieved spam from "anyone" on this domain, I probably did not send it. Some bright spark is sending email with a "from" header of "*Something Random*@cavey.co.uk" (such as xhvqh@cavey.co.uk) to an email spam-list and I am receiving all of the "User Unknown" automated replies. As such, there is not much I can do to block people pretending to be from this domain as it is a "feature" of the whole email system. As such I have had to resort to binning all email (well redirecting it to a hotmail account) to everything except the principle email address I use.