I have come to the following conclusions by examining the damaged files: 1) No line has been added or deleted. 2) Actually, after digging a little deeper, I saw that moving 5 lines from line 175 in the raw image file to line 169 completely cured the file. In other words, two blocks of 5 lines have been SWAPPED in the file with no loss of data. I swear that LISTSERV does not block DD card input lines by any value, least of all 5!! 3) Idea: 5*80= 400. Size of a default DMTNJI RSCS buffer? 400 bytes... Nodes affected? Everything down and including SUVM. The question is: does anybody near SUVM install RSCS V2 recently (or suchlike?) Conclusion: probably not a LISTSERV bug. Will wait to see if it happens again. Meanwhile I'll re-issue a PUT, we have three new LISTSERVs: CUNYVM, JPNSUT30 and LEHIIBM1. Re: my reply to Niall: I'm sorry I did not resend the original message. I never use MAILBOOK, it's too slow on our system (paging - 40/sec today). The problem was that the STANFORD mailer keeps sending MAIL files with a lrecl > 80 and it causes an EXECIO error 1 sending the file. Version 1.5g will ignore this error and proceed normally -- the mail standard is 80 chars/line. Eric