Don't assume that your RSCS is involved in the mailing of traffic to "INTERBIT" I sent a message to 00000000@INTERBIT and (L)MAILER reported: * Mail forwarded to SMTP@PSUVM * From SMTP: Mail delivered to: <@INTERBIT.CREN.NET:[log in to unmask]> Our default .BITNET mail traffic is routed to INTERBIT.CREN.NET which apparently is a Princeton University site: dig interbit.cren.net mx interbit.cren.net. 14400 IN MX 10 outbound.princeton.edu. (I still have not received the "bounce" from my test message.) /Pete