Arthur,
On a secondary note, iirc several months back a post was made about editing the
sendmail.cf/mc to check the servers allowable relays database prior to dnsbls. I've no
idea whether this has been integrated into later versions of BQ or Brian's ISO's. On my
installs I just make sure I add my dnsbl lines into the sendmail.mc just above the
"MAILER(smtp)dnl" line, so they are performed last, after other checks, seems to work.
Certainly worth adding your problem email servers IP to "Network Services > Email >
Advanced Tab > Relay Email From Hosts/Domains/IP Addresses (optional) Box" - if mail
then passes through you can still use Spamcop!
Good luck.
Brett