Yeah I looked at the message headers and they arent being sent by us (phew!) - the word seems to be 'sit it out' but it realy makes me angry since we are a business that depends on email, and being blacklisted would be apolcalyptic....

Out of interest, why do mail servers relay mail from ISPs that allow spammers? Surely all the spam in the world could be solved by a law that says:

It is illegal for ISPs to allow spammers on their network, or recieve mail from an ISP that allows spammers.

?