I was wondering if anybody will advice me in how to make a Listserv distribution list more secure. Currently the headers of the XXX List I am using for distribution purposes are the following: XXX Distribution List Owner= [log in to unmask] Errors-To= Owner Editor= [log in to unmask] Send= Editor,Hold,Confirm Subscription= Open Review= Owner Default-Options= Review Ack= No Validate= No Auto-Delete= Yes,Full-Auto,Delay(5),Probe(30) With these settings I am receiving a lot of external e-mail from unknown users who are trying to use this list for spamming. Is there a way to prevent unknow users or users within the list from posting to this list? I did run the following command to control all the current subscribers from posting to the list: QUIET SET XXX REVIEW FOR *@* Any comments or suggestions will be greatly welcomed. Thanks Lorena.