What is Spamhaus and why is it so influential?
Spamhaus overview:
What it is:
Non-profit organization tracking spam sources
Maintains multiple blocklists (SBL, XBL, DBL, PBL)
Provides data to email providers worldwide
Why it matters:
Used by most major ISPs and email providers
Trusted industry standard
High-quality, well-maintained lists
Spamhaus lists:
SBL: Known spam sources
XBL: Exploited/compromised IPs
DBL: Domain blocklist
PBL: Policy blocklist (dynamic IPs)
Impact of listing:
Widespread delivery failure
Cannot be ignored
Must address seriously
Spamhaus listing is the most serious blocklist event.
The most influential harbor authority. Their bans affect nearly every port.
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