On 11/9/2005 09:37, Chris Barnes wrote: > Pete Weiss <[log in to unmask]> wrote: >> At 23:27 11/8/2005 Tuesday, Eric Johnson wrote: >>> The fact of the matter is that you can not ban a person from an >>> email list without some really strenuous checking. What you really >>> can do is ban a personna. If you toss a person and they come back >>> with a different account but behave, haven't you achieved the goal? >> >> More complicated than that: persona "A" subscribes on-list, but >> persona "B" harasses off-list. How do you relate that "A" and "B" >> are the same? > > IP address of the sender in the Received: headers.... > This is not a reliable indicator that different messages were sent by the same individual. I can think of several reasons why messages from different individuals might have the same source IP address in the initial 'Received' header. * The messages were sent by different individuals from a shared computer. * The messages were sent from different computers that connect to the SMTP server through the same proxy server. * The messages were sent by different individuals using the same webmail service. * The messages might were sent from different systems which acquired the same dynamically assigned IP address. -- Paul Russell Senior Systems Administrator OIT Messaging Services Team University of Notre Dame