Sounds like an (auto) forward problem. If you can't figure out who the subscriber is, then I suggest turning off monitoring and (then) receive the original "bounce" directly to the * ERRORS-TO= address (at least until the next bounce). This could reveal the RECEIVED line headers which should indicate the point of forwarding to the misdirected (or obsolete) userid. /Pete Weiss in Summer-like downtown University Park, PA USA