Email blocklist · DNSBL · IP addresses
MON · 14 SEP 2026
HostKarma
About
Reputation-style list with graded responses. Useful for scoring rather than blocking. Small operator; lower coverage than the major lists.
Listing criteria
Reputation-style list returning Karma scores rather than binary listings. Multiple return codes indicate trust levels.
How to query
For an IP address 1.2.3.4, query reversed-octets-dot-zone:
dig +short 4.3.2.1.hostkarma.junkemailfilter.comA returned IP (such as 127.0.0.2) means listed. Each blocklist has its own set of return codes meaning different things; the operator's documentation explains theirs.