Hi everyone Can anyone give me a tip or two on placing a cuda in front of our List SERVER. I will have all mail to list.natca.net directed to our barracuda and I will tell barracuda anything to list.natca.net needs to go to the list server.But I was wondering is there anything else i need to do to the cuda as i know it checks with the recipient server to see if the delivery address is valid, I was wondering will the listserver accept everyting the cuda sends it, do i have to add users (lists) to the cuda. I would like if during the handshake of the cuda and the listserver if the listserver sees a message addressed to a legit list but from a non legit sender it would just tell te cuda hey no deal and not process the message. Maybe im putting to much into this but i was just wondering. Any ideas and anyone else successfully added a cuda in front of their listserver. thanks in advance tim casten National Air Traffic Controllers IT Administrator -- Tim