Email blocklist · DNSBL · IP addresses
TUE · 28 JUL 2026
Mailspike BL
About
Pure block-list view of Mailspike's data. Binary instead of graduated. Useful when the mail filter wants a yes/no answer rather than a reputation score.
Listing criteria
Hard-block list for the worst-reputation IPs. Subset of the rep.mailspike.net data presented as a binary blocklist.
How to query
For an IP address 1.2.3.4, query reversed-octets-dot-zone:
dig +short 4.3.2.1.bl.mailspike.netA 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.