Polspam Level 3 Blacklist (BL)

Polspam Level 3 is a strict IP and ASN blocklist (blacklist) used to identify IPs and domains engaged in persistent spamming.

Updated on 18 Jun 2026: We updated this guide with Polspam's BL-H3 lookup details, shared-IP guidance, and clearer delisting steps.

Summarize with

Check if you are listed on Polspam Level 3 Blacklist (BL)

And 143 other blocklists.

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

Spamhaus

0Spam

Abusix

Barracuda Networks

Cisco

Mailspike

NoSolicitado

SURBL

UCEPROTECT

URIBL

8086 Consultancy

abuse.ro

ALPHANET

Anonmails

Ascams

BLOCKEDSERVERS

Brukalai.lt

Calivent Networks

dan.me.uk

DrMx

DroneBL

EFnet

Fabel

GBUdb

ImproWare

JIPPG Technologies

Junk Email Filter

JustSpam

Kempt.net

Mail Baby

NordSpam

nsZones

Polspam

RV-SOFT Technology

Schulte

Scientific Spam

Spam Eating Monkey

Spamikaze

SpamRATS

SPFBL

Suomispam

System 5 Hosting

Taughannock Networks

Team Cymru

Tornevall Networks

Validity

www.blocklist.de Fail2Ban-Reporting Service

ZapBL

2stepback.dk

Fayntic Services

ORB UK

RedHawk

technoirc.org

TechTheft

What is Polspam Level 3 Blacklist (BL)?

The Polspam Level 3 Blacklist (BL), with the zone name bl-h3.rbl.polspam.pl, is a Polish real-time blacklist (RBL) for identifying spam sources. This tier is the hardened level 3 list for IPv4 addresses and ASNs, and Polspam describes it as extremely hard. A positive BL-H3 DNS response returns 127.0.2.3. It is part of the Polspam project, which publishes spam-source data to discourage abusive sending and poor netiquette.

Because BL-H3 is strict and restrictive, the operators recommend against using this blacklist to reject email outright. It is better used inside a scoring or filtering policy, where a listing can add risk weight without making the blocklist the sole reason a legitimate message is refused.

Who runs Polspam Level 3 Blacklist (BL)?

The Polspam project is run as a hobby by a community of volunteers. It is not a commercial entity; it does not accept donations, run advertisements, or generate revenue. According to its operators, it is not an electronic service provider in a legal sense. Its purpose is to gather and publish information about sources of spam based on reports and data from the internet community. The project says it does not collect personal data and asks that communications remain anonymous, focusing on the domain and its behavior rather than the individuals involved.

How to check a Polspam Level 3 Blacklist (BL) listing

Polspam BL-H3 uses standard DNSBL-style lookups for IPv4 addresses. Reverse the sender IP address octets, append the BL-H3 zone, and check for the returned answer. For domain-related shared-hosting issues, the provider also needs to check hosted domains and subdomains against Polspam's domain zones.

Example DNS queriesBASH

nslookup 15.2.0.192.bl-h3.rbl.polspam.pl
nslookup example.com.rhsbl.rbl.polspam.pl
nslookup example.com.rhsbl-h.rbl.polspam.pl

For a sender IP, a BL-H3 hit is indicated by the 127.0.2.3 answer.
For a shared IP address, one abusive domain can affect other domains on the same host. The hosting provider has the access needed to identify which hosted domain is causing the listing.
For authentication triage, compare your sending sources against SPF, DKIM, and DMARC. Suped's DMARC reports can help confirm which IPs are authorized for your domain before you ask a provider to investigate.

How to get removed from Polspam Level 3 Blacklist (BL)

The delisting process for the Polspam Level 3 Blacklist (BL) is manual and requires direct communication. There is no automated removal form. The operators state they do not delist domains known for notorious or deliberate spamming. Removals are considered for one-off incidents or accidental listings. Honesty and transparency are essential; the operators say they can verify a domain's history and do not negotiate with senders who hide relevant facts.

Before you request removal, take these steps:

Identify the cause: Understand and fix the root cause of the listing, such as a compromised computer, misconfigured server, unauthenticated SMTP access, or intentional spam activity.
Stop the abusive traffic: Disable the sender, close the relay or account, remove the abusive domain, and verify that legitimate mail is passing SPF, DKIM, and DMARC.
Prepare your explanation: Write a detailed and honest description of why your domain was listed. Include what happened, which domains were involved, whether consent existed, and whether any outsourced email campaign or tracking technology was used.
Gather required information: Your email must include the domain name, the domain IP address, and the suspected cause. If the problem affects a specific destination, include the recipient domain and relevant headers or bounce examples with personal data removed.
Format your email correctly: Send plain text only. Emails containing HTML, scripts, remotely loaded images, tracking objects, logos, or personal signatures are ignored.
Work through your provider when needed: If your domain is clean but a shared IP address is listed, ask the hosting provider to identify the listed domain on that server. Polspam says only the provider can reliably determine that on shared infrastructure.

Do not request delisting of an IP address directly. An IP address or hostname is listed automatically because a domain on it is on the blacklist. Once the offending domain stops spamming and is removed from the blacklist, the associated host IP address is removed automatically after seven days.

What is the impact of a Polspam Level 3 Blacklist (BL) listing?

The impact of being listed on the Polspam Level 3 Blacklist (BL) depends on how the recipient's mail server uses the data. Polspam does not block or ban traffic by itself. It publishes a database that mailbox providers and system administrators choose to consult. The final decision to accept, reject, or filter an email belongs to the recipient's mail server.

The operators specifically advise against using this particular blacklist for outright blocking because its policy is highly restrictive. In a scoring system, a listing is more likely to contribute to spam-folder placement than to a hard rejection. If a receiver ignores that recommendation and treats the blacklist as a reject rule, rejection is possible. Any listing on a blacklist or blocklist can also damage sender reputation, especially when the same IP address is shared by several domains.