I've SCANed your subscriber list for the nike.com uses: those were the only two and they appeared only once (unless concealed). I suspect any one of the following: 1) the NIKE.COM SMTP RFC821 RCPT TO authentication system is broken 2) NIKE.COM SMTP doesn't understand multiple RFC821 RCPT TO: fields without mapping to RFC822 recipients 3) a bug in LISTSERV distribute (highly unlikely) Pete Weiss at Penn State