I get too many bounces originating from non existing domains, so I tried Nagy's qmail-1.03-mfcheck.2.patch. But it does not work. Any non-existent domain sender is accepted. I suppose it's because I use rblsmtpd? What can I do then? I am not a programmer. I got the patch from Russel's qmail home page. DNS_HARD, DNS_SOFT and DNS_MEM was undeclared, so I had to manually include "dns.h" in qmail-smtpd.c. I use rblsmtpd like this: /usr/local/bin/supervise /usr/local/qmail/supervise/tcpserver env - \ PATH="/usr/local/bin:$PATH" TZ=MET-1METDST,M3.5.0,M10.5.0 \ tcpserver -x /usr/local/etc/tcp.smtp.cdb \ -v -p -t 5 -c 400 -b 40 -u 203 -g 200 0 \ smtp /usr/local/bin/smtplog \ /usr/local/bin/rblsmtpd -rrelays.orbs.org \ /usr/local/bin/rblsmtpd -rrbl.maps.vix.com \ /usr/local/bin/rblsmtpd -rdul.maps.vix.com \ /usr/local/qmail/bin/qmail-smtpd 2>&1 \ | /usr/local/bin/accustamp \ | /usr/local/bin/cyclog -s100004000 -n2 /var/adm/smtpd smtpd 3 & P.S. I wonder why I have not seen my previous letter on this qmail list show up yet. The MX host for list.cr.yp.to seems to be unreachable today. -- Med venlig hilsen / Regards Netdriftgruppen / Network Management Group UNI-C Tlf./Phone +45 35 87 89 41 Mail: UNI-C Fax. +45 35 87 89 90 Bygning 304 E-mail: [EMAIL PROTECTED] DK-2800 Lyngby