We are getting repeated e-mail attacks that contain virus dangers and each person is getting about thirty in their Inbox. We run Microsoft Exchange 2003 and the end users use Outlook 2003. Each time we add a filter for the e-mail address, subject line or attachment, the attacker changes one variable and they keep coming in. Our virus software which is Symantec is catching the software but we want to stop the repeated the attacks. Where and how do you check the header files in Exchange 2003 so I can determine if it is from the same IP address and then resolve the ISP provider that it is coming from?