>We are writing a gateway too and it would help us be a >good network citizen if we knew what LISTSERV will >interpret as a rejection notice. I know listserv checks the subject field as follows: If subj = 'UNDELIVERED MAIL' |, /* Crosswell MAILER */ Left(subj,22) = 'UNABLE TO DELIVER MAIL' |, /* Mult*cs */ subj = 'RETURNED NETWORK MAIL' Then /* VAX-type MAILER */ Call RejMail 'mail subject indicates a delivery problem' I believe he also checks to see if the sender was a "defined trusted mailer" from, ultimately, the BITEARN NODES file. /mrg