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Proofpoint
SORBS
Composite list combining spam, dynamic, proxy, and web sub-zones.
- DNS zone
dnsbl.sorbs.net- Target
- IP addresses
- Severity
- medium
What it lists
SORBS (Spam and Open Relay Blocking System) is a composite of multiple sub-zones covering open relays, dynamic IPs, hijacked space, web compromises, and spam sources. The aggregate dnsbl.sorbs.net zone returns any sub-listing.
Who gets listed
Open relays, dynamic ranges, compromised web servers, and spam sources detected by SORBS sensors.
Reputation impact
Mixed. Some MTAs weight SORBS heavily, others ignore it. Generally lower impact than Spamhaus or Barracuda.
How to delist
Identify which SORBS sub-zone matched, fix that specific issue (close the relay, prove the IP is static, remediate the web compromise), then submit a delist request.
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