Spamhaus Project
Spamhaus PBL
End-user / dynamic IP ranges that should not deliver mail directly.
- DNS zone
pbl.spamhaus.org- Target
- IP addresses
- Severity
- medium
What it lists
The Policy Block List (PBL) marks IP ranges where the ISP or network operator says no legitimate SMTP should originate — typically residential and dynamic ranges. A PBL listing is not an accusation of spam; it is a routing signal.
Who gets listed
Residential, dynamic, and consumer ranges submitted by the network operator or detected automatically.
Reputation impact
Moderate. Most providers reject SMTP from PBL-listed IPs unless authenticated. Move to a static IP with proper rDNS.
How to delist
If the IP is genuinely a fixed mail server, request delisting through Spamhaus's self-service PBL removal tool. Otherwise route outbound mail through your ISP's authenticated relay.
Check your domain or IP against Spamhaus PBL
on.bo queries Spamhaus PBL together with 30+ other lists in a single lookup.
Run blacklist check