It's your node. Underscores in host names are not conformant with RFC822, RFC1123, and the host name one. I don't remember it's number. Some SMTP implementations enforce it, some do not. Don't let your unix support people tell you that sendmail is a reference implementation of the relevant standards, it is not. Close but not. -- Glenn A. Malling <[log in to unmask]> Syracuse University Computing Services +1 (315) 443-4111 220 Machinery Hall Syracuse, New York 13244-1260 Postmaster for SUnix and LISTSERV.