Hello Postfixers, attempting to get my postfix server in good shape I read the Book of Postfix to help me resolve some key issues.
Now, I implemented the use of the dnsbl per p. 98 in the Postfix book. On the postfix rbl list I included the now standard list of rbls including spamcop and spamhaus. This part of the rbl works as expected. I then included my own dnsbl defined in my BIND9 server and included in the postfix config. The curious issue about using my own dnsbl is not all reversed IPs resolve to 127.0.0.3 as expected since the target IP is definitely in the range of IPs defined in the local dnsbl. This means running the host command with the reversed ip address with the dnsbl hostname tacked onto the end may or may not resolve to 127.0.0.3. Some IPs resolve correctly and some do not but both target IP addresses have a range defined in the custom dnsbl. Example: host 1.133.92.204.dnsbl.mydnsbl.tld 1.133.92.204.dnsbl.mydnsbl.tld has address 127.0.0.3 host 1.73.75.217.dnsbl.mydnsbl.tld Host 1.73.75.217.dnsbl.mydnsbl.tld not found: 3(NXDOMAIN) Yet both IP addresses referenced above reside within the same list. Has anyone seen this before? And, howto debug this situation? Please advise.
