I believe a firewall is blocking some traffic that is preventing LISTSERV from working properly. The specific problem I have is this: - The e-mail addresses that are being bounced are not being processed by LISTSERV (when I look at my mail server logs, it shows that the bounced e-mails are being denied access to my LISTSERV server). Therefore, no e-mails are being deleted unless a subscriber explicitly states that they want to be removed from the list. Has anyone had any issues with this? Is this a firewall problem? Is it a LISTSERV setting that I misconfigured? Regards, Ki Song