https://www.spamhaus.org/blocklists/combined-spam-sources/
Combined Spam Sources (CSS) | IP DNSBL for email filtering
An SMTP traffic blocklist, listing port-25 based detections due to unsolicited emails, poor list hygiene, or compromised accounts sending malicious emails.
ip dnsblemail filteringspam
https://www.spamhaus.org/blocklists/spamhaus-blocklist/
Spamhaus Blocklist (SBL) | IP DNSBL for effective email filtering
Spamhaus Blocklist contains IPs identified as sending spam, hosting malicious content, hijacking IP space, or acting like a bulletproof hosting company.
effective email filteringsbl
https://www.spamhaus.org/blocklists/exploits-blocklist/
Exploits Blocklist (XBL) | IP DNSBL for email filtering
The Exploits Blocklist flags compromised IPv4/IPv6 addresses that have been hijacked to use by third-party exploits.
ip dnsblemail filteringxbl
https://www.invaluement.com/
invaluement anti-spam lists, 1 URI DNSBL & 2 IP DNS lists
The invaluement anti-spam lists includes 1 URI and 2 IP DNS lists which block evasive spams that slip past most spam filters.
anti spamip dnslistsuridnsbl