Just thought ya'll would be interested to know that I just spent about 45 minutes trying to convince an I.T. guy at one of the largest regional banks in my area that a spam filter should ONLY check the IP address of the sending mail server against RBLs, NOT every single IP contained within the header.
I told him that often, dynamically assigned IPs will show up in blacklists even if they've never sent spam and I explained that on any given day, a person's own computer can get reassigned a blacklisted IP which was previously used by a spammer or by a worm-infected computer even if that computer has never had a worm and the user never had sent a spam. I also explained how he doesn't have to worry about what might happen if he didn't check other IPs in the header because if that person's computer were spewing out spams, he still be able to block them if one were to happen to head his way. My client who couldn't send to this bank uses **my** server for sending mail and they are only allowed to do so based on authentication. But the messages are getting blocked because that bank's spam filter is checking every IP in the header and my client's IP is blacklisted. Unbelievable. Rob McEwen PowerView Systems [EMAIL PROTECTED] (478) 475-9032