The list can't see originating IP addresses, it only has email messages to work with. And then there is the question of which IP address are you concerned with: the IP address of the computer a person was using to write a message, or the IP address of the mailserver that eventually processed their message on the last hop to your system? In other words, is it true that you don't care WHO is posting to your list, as long as you have some idea of WHERE they might happen to be - at least, electronically speaking? >>> [log in to unmask] 8/14/2006 9:50:19 AM >>> Hi We'd like to be able to restrict posting to a list based on IP address/domain name. The list is Send= Public but we want to restrict the ability to post to local IP addresses only. Can this be done using the "Service" keyword? My hunt through the documentation seemed to indicate that the Service keyword was only to be used for subscription requests. If there is a way to do this other than the Service= keyword Thanks Scotty -- Steve Howie Campus Services, CCS University of Guelph