Overview
MSRBL (Mail Spammer RBL) was designed as an aggregated blacklist that combined data from multiple independent sources into a single queryable list. This multi-source approach was intended to increase coverage while maintaining quality by requiring corroboration across sources before listing.
MSRBL covered both IP-based spam source detection and image spam β a technique that embeds spam content in images to evade content filters. The project has been discontinued.
How It Works
MSRBL aggregated data from spam traps, abuse reports, and partner organizations. Its multi-source methodology meant that an IP needed to appear in data from multiple feeds before being listed, which was intended to reduce false positives. The image spam component analyzed attachments in email submissions to detect visual spam patterns.
How to Get Delisted
MSRBL is no longer active and no removal is possible or necessary. The multi-source aggregation approach it pioneered is now common in modern threat intelligence platforms. For current deliverability issues, consult active blacklists.