Hi, > Well, if you blocked the IP address you would be blocking Hotmails SMTP > server not his personal machine as Hotmail is a web-based mail service. Probably a long shot, but you should seek the cooperation of hotmail abuse dept., possibly with the assistance of your attorney, to get maximum cooperation from hotmail. If any threats have been issued in the email you could also seek law enforcement's assistance. Only hotmail would be able to tell you the IP address. And if the perpetrator is smart enough to use an anonymizer service then you have little or no hope of finding the true IP address. > The only option you have is to block all Hotmail messages. Not a good idea, as this would also block legitimate email from anyone else at hotmail, and believe it or not, a lot of people still use hotmail as their "business address" for email. I personally know of some parts of the world where it is considered more prestigious to have a hotmail or yahoo address compared to an email address under a registered business domain name! best regards Mike