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Jerkmate
https://www.spamhaus.org/resource-hub/email-security/query-the-legacy-dnsbls-via-korea-telecom/
Email Security | Query the legacy DNSBLs via Korea Telecom? Move to Spamhaus Technology’s free Data...
If you're using the free legacy DNS Blocklists (DNSBLs) through the Public Mirrors while running on Korea Telecom’s infrastructure, you'll need to make a few...
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https://www.spamhaus.org/blocklists/
Blocklists | Trusted, actionable DNSBLs for email filtering
Spamhaus DNS Blocklists (DNSBLs) help email administrators filter emails and protect users from phishing, malware, spam and more.
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https://www.spamhaus.org/faqs/
FAQs | Deliverability, DNSBLs, Malware & reputation data
Find frequently asked questions relating to Spamhaus' data and research, offering general and best practices.
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https://www.spamhaus.org/resource-hub/email-security/best-practice-dnsbls-and-email-filtering-how-to-get-it-right/
Email Security | BEST PRACTICE | DNSBLs and email filtering - how to get it right
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https://www.spamhaus.org/resource-hub/dnsbl/qname-minimization-and-spamhaus-dnsbls/
DNSBL | QNAME Minimization and Spamhaus DNSBLs - an explanation
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https://www.spamhaus.org/resource-hub/email-security/query-the-legacy-dnsbls-via-microsoft-move-to-spamhaus-technology-s-free-data-query-service/
Email Security | Query the legacy DNSBLs via Microsoft? Move to Spamhaus Technology’s free Data...
If you're using the free legacy DNS Blocklists (DNSBLs) through the Public Mirrors while running on Microsoft’s infrastructure, you'll need to make a few small...
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https://www.spamhaus.org/blocklists/zen-blocklist/
ZEN Blocklist | Combined IP DNSBLs for effective email filtering
The Zen blocklist contains all IP-based DNSBLs offered free by Spamhaus (SBL, CSS, XBL, and PBL) to make querying simpler and faster.
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https://www.spamhaus.org/resource-hub/dnsbl/mta-developers-allow-use-of-domain-dnsbls-at-the-smtp-level/
DNSBL | MTA developers: allow domain DNSBLs at SMTP level | Spamhaus
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