What is WPBL?

WPBL (Weighted Private Blocklist) is a private blocklist that uses weighted scoring across multiple data sources. It's used by some mail systems as part of their spam scoring rather than binary blocking.

Impact Level: Low. Limited deployment but occasionally appears in blocklist monitoring results.

Zone: db.wpbl.info

Key characteristics:

• Weighted scoring rather than binary listing
• Aggregates data from multiple sources
• Designed to reduce false positives through weighting

Delisting: WPBL uses automatic expiration based on behavior improvement. Check their website for current status.

WPBL doesn't just say guilty or innocent - it calculates a probability, letting mail systems decide their own threshold for action.