We are writing an automated mail forwarding program for Microsoft mail. One option will be to send a message back to the sender notifying them of the changed address. We would like to be sure that such messages will be captured by the LISTSERV filters, even for Safe=no lists. I know that LISTSERV looks for subject lines that begin with "undeliver". What other words does it look for? Roger Fajman Telephone: +1 301 402 4265 National Institutes of Health BITNET: RAF@NIHCU Bethesda, Maryland, USA Internet: [log in to unmask] Postmaster for CU.NIH.GOV/NIHCU, LIST.NIH.GOV/NIHLIST, NIH3PLUS