I see the error sometimes too. I think it's because my listname + address wraps to two lines. Can I tell LISTSERV / LSMTP to put the address in one line or do I just have to shorten the list name so it won't wrap to two lines? --- Error-for: [log in to unmask] Error-Code: 0 Error-Text: Mailer mailgate.kk.dk said: "503 Sender already specified" ... Sender: Bibliofind Books For Sale Mailing List - Under US$100 <[log in to unmask]> --- Error-for: [log in to unmask] Error-Code: 0 Error-Text: Mailer mailgate.kk.dk said: "503 Sender already specified" ... Sender: Bibliofind Books For Sale Mailing List - U [Aaron West] nder US$100 <[log in to unmask]>