IPmanager checks whether IP addresses can really be used or not.
This check goes in two steps:
- Check if an IP address is physically available in the network.
- Check if an IP address is in the DNSBL blacklists.
Read more in Checking IP addresses.
DNSBL (DNS blacklist) is a set of lists of domains and IP addresses, which are normally used to prevent spam.
IPmanager uses the lists available in Settings → DNSBL blacklists. Click on Add to create a new list. Then specify the address for the blacklist - a domain name used to check whether IPs are bllacklisted.
We recommed you using one of the following blacklists:
- bl.spamcop.net;
- zen.spamhaus.org.