Hi, some of my users forward external mails to my host. In some cases those forwarding hosts don't filter spam. How do I parse back through forwarding headers to find the true source IP and run dnsrbl checks on that IP. I don't want to reject those mails in case of spam, so that the forwarding host will become a backscatter, but just marking them. I tried to set the forwarding host IPs to trusted_networks, which helps with wrong dnswl.org checks, but RBL checks are disabled then. Any ideas how to handle that?
Ciao Marcus
