SPFBL DNSBL lists systems that send spam.
This DNSBL uses SPFBL’s dynamic reputation table as a basis to list the IPs and functions in the traditional manner, returning:
– 127.0.0.2: listed due to bad reputation and confirmed by anonymous complaints and
– 127.0.0.3: listed due to being a suspected source of spam or difficulties in identifying the source.
In the case of returning 127.0.0.3, they block all IPs which they consider unsuitable for sending e-mail.