I have the same problem
is displayed the contents of the directory /usr/local/ispconfig/interface/web/mail /usr/local/ispconfig/interface/web/dashboard and so on......
add # to # reject_rbl_client dul.dnsbl.sorbs.net, # reject_rbl_client bl.spamcop.net, # reject_rbl_client dnsbl.sorbs.net, bye
Separate names with a comma.
