Firstly, is there any risk of all mail from my domain becoming blocked as a result of spam emails with it in the from line ? I normally recieve a handful of "undelivered mail" with the standard penis enlargement / online pharmacy messages, however over the last few hours the situation has been far worse (and so far hasnt shown any signs of improving), im presently recieving around 10/min totalling 3000+ within a period of a few hours...
Also, is there a way to take any action against this? (I seem to remember a site which would analyse mail-headers and attempt to find an isp etc ?)