I have had problems sending mail to Bitnet Listservers since our department switched to Novell's Groupwise for E-mail. The returned message is of the following form: LISTSERV is undeliverable for Lstsrv-l MAIL FROM:<[log in to unmask]> 501 Syntax Error. Unexpected Token '_' The Listserv software seems to be objecting to the '_' in the gw_mail part of the address. I have spoken to our network administrator about this, but he says he cannot change this easily. Besides, he says, this is a legal groupwise address. I would be grateful if someone can point me to information on the requirements of the Listserv software with regard to addresses. Bob Kane [log in to unmask] 71764,[log in to unmask]