Hi. We're running listserv and LSMTP on Windows NT. List has been running for about a year without any problems. Recently started receiving the below message and consequently cannot send commands or otherwise to the server. Any help is appreciated. Thanks, Mike Clark ============================= ============================= <[log in to unmask]>: host mailhost.xohost.com said: 553 <[log in to unmask]>... Not server for ourhost.ourdomain.org