Try e-mailing with an ARPA % hack notation e.g., to: [log in to unmask] If you get a similar "bounce," then I would assume that their is a problem in the SMTP protocol used between home.ease.lsoft.com and igc.apc.org. If you do not get a bounce, I would start considering the BANG (!) that is part of your listname which looks more like an e-mail syntactic element than a character of a userid which might confuse the receiving (igc) system. /Pete Weiss at Penn State