Unsubscribe Blocklist: lists IPs that send mail to addresses that have previously unsubscribed. Targets non-compliance with unsubscribe requests rather than ...

Internal blocklist maintained by InterServer hosting. Lists IPs that have sent spam to InterServer-hosted domains. Primarily affects deliverability to ...

Lists bogon IP ranges: IP address space that should never appear as a source address on the internet. Includes unallocated IANA ranges and reserved space. Not ...

Independent DNSBL listing spam sources and open relays. Used by a subset of mail server operators and SpamAssassin configurations.

Listed IPs associated with botnet-driven spam and malware distribution. Operated by an independent researcher known as Janit0r. Shut down in 2019 when the ...

Japanese DNSBL covering spam sources affecting Japanese mail systems. Primarily deployed in Japanese ISPs and corporate mail environments.

Latin American blocklist targeting spam affecting Spanish-language email users. Primarily deployed in Spanish and Portuguese-speaking regions.

Swiss network operators group blocklist. Maintenance has become inconsistent. Primarily historical relevance to Swiss email infrastructure.

Simple independent DNSBL listing IPs that send mail to S5H.net's trap network. Low maintenance overhead for operators, automatic listing and expiry.

Independent DNSBL operated by a German researcher. Has been discontinued. DNS queries return NXDOMAIN or SERVFAIL. Historical reference only.