Hello All, I have posted a similar query before and not yet received any useful feedback, thus I thought I'd try again. I am running listserv 1.8d and LSMTP 1.1b on an NT box, using Apache as the web server. When using the web based interface for this service, we can do almost everything except update the headers. Whenever we issue the update command, even if we don't change the header at all, the wa.exe script simply returns the message "Error in header data stream". This meaningless error gives no help whatsoever and I cannot trace what is causing the error. This is driving me to distraction and has been ongoing now for over three months, if anybody out there has any ideas for other things to try I would be most grateful. Yours, with crossed fingers, Duncan Russell Listserv Manager ---------------------------------------------------------------------------- --------- Mr Duncan Russell Information Technology Department RAL Computing Services Support Group Phone (44) (0) 1235 445542 Atlas Centre RAL Fax (44) (0) 1235 446626 Chilton DIDCOT Oxon E-mail [log in to unmask] OX11 0QX UK RAL Computer Services Support Group WWW Page: http://www.itd.clrc.ac.uk/Group/ITDSERRCS ---------------------------------------------------------------------------- ---------