I know that we have a problem here, but it has nothing to do with MAILER@DEARN, but with our gateway software. I discussed the problem already with Eric Thomas, but did not find a solution and have to talk to the GW software developpers. Maybe this group can give me some suggestions (beside of stopping the gateway or getting rid of X.400 --). What happens? People in the X.400 world produce messages which contain more than 80 columns and send it to users in EARN/ BITNET for example [log in to unmask] The gateway realizes that those messages cannot be handled by mailers so it makes files out of them with funny names like MPM M|@#$%^ and sends them via SENDFILE (with option ACK) to LISTSERV. The rest follows as desribed by Christian, i.e. a DIST2 job sent to the LISTSERV backbone etc.. I do not really know why those postmasters worldwide (except me) get those rejection messages and I do not know whether it helps to take away the ACK-option using SENDFILE. Manfred