Why is my domain listed in Razor2 and how do I remove it?
Matthew Whittaker
Co-founder & CTO, Suped
Published 10 Jul 2025
Updated 21 May 2026
12 min read
Summarize with
If your domain appears to be listed in Razor2, the direct answer is this: Razor2 is usually not listing your domain the way a normal DNS blocklist or blacklist does. Razor2 is a distributed fuzzy-checksum system used by filters such as SpamAssassin to identify message bodies that look like previously reported spam. When you see a Razor2 hit, it normally means the content of an email, or a meaningful part of that content, matched patterns already reported by Razor2 clients.
That distinction matters because there is usually no clean "remove my domain" button. The practical fix is to identify the email that triggered the hit, stop the sending source if it is unauthorized or forgotten, change the message body if the content is the trigger, then watch your authentication and reputation data for recovery. I treat Razor2 as a content signal first and a domain reputation clue second.
In practice, the fastest path is to combine three checks: DMARC reports to see who is sending as your domain, a real message test to inspect SpamAssassin-style scoring, and blocklist monitoring to see whether the same sender has broader reputation problems. Suped is relevant here because its product brings DMARC, SPF, DKIM, blocklist monitoring, hosted SPF, hosted DMARC, and alerts into one workflow, so you can move from "Razor2 hit" to "which server sent this" without digging through raw XML files.
What Razor2 is actually telling you
Razor2 works differently from a traditional IP or domain blocklist (blacklist). A normal blocklist often says, "this IP address" or "this domain" has a reputation problem. Razor2 focuses on the email body. It creates and compares fuzzy checksums of message content, then filters can assign spam score when a message body matches material that other participants have reported.
The key distinction
A Razor2 result does not prove that your domain itself has been added to a central domain blacklist. It proves that a tested message body looked enough like content reported through the Razor2 network for the receiving filter to score it.
The confusion usually starts because deliverability reports and content checkers sometimes present Razor2 as if it were a simple listing. You run a test, see a rule such as RAZOR2_CHECK, and assume your domain has been entered into a database with a delisting form. Usually, it has not. The message content is the signal.
- Content match: Your email template, footer, link structure, or body copy matches content reported as spam.
- Sender clue: The sending domain or IP can still have separate reputation issues, even if Razor2 itself is content-based.
- No simple removal: Because Razor2 data is distributed, recovery means changing the cause, not submitting a standard delisting request.
- Evidence needed: Use DMARC aggregate data, message headers, and content tests before changing DNS or sender policy.
A flowchart showing how to investigate a Razor2 content hit.
Why a domain with no bulk email still triggers Razor2
The most common surprise is finding real mail volume after believing the domain has not sent bulk email. I have seen this happen when an old application, web form, CRM integration, transactional service, or forgotten server still sends mail. The person checking the domain knows no marketing campaign is active, but DMARC reports show thousands of messages sent over the last month.
That is why I start with sender discovery, not delisting. If a domain is in the visible body of a message that looks like spam, Razor2 can score it. If the domain is used in links, footers, tracking redirects, boilerplate disclaimers, or unsubscribe text copied across campaigns, it can appear in content that receivers dislike. If the domain has been used in compromised contact forms or hacked website mailers, the owner often sees the symptom before they find the source.
|
|
|
|---|---|---|
Old app | DMARC source IPs | Disable or reauthorize |
Copied template | Body and footer | Rewrite content |
Abused form | Web logs | Rate-limit and lock |
Shared links | Tracking domains | Use clean links |
Forwarded mail | Headers | Trace origin |
Common Razor2 trigger paths
A Razor2 hit can also be caused by content that is not malicious but looks overused. Generic sales copy, scraped legal footers, repeated URL blocks, and old HTML templates all raise the chance of a fuzzy match. The answer is not to rotate domains. The answer is to stop the bad source, remove risky copy, and prove which authenticated sender produced the mail.
Do not assume no send means no send
If DMARC reports show mail from a source you forgot about, treat that as the lead. Old sending infrastructure can keep sending password resets, alerts, invoices, trial notices, or form responses long after the owner thinks the domain has gone quiet.
How to confirm whether Razor2 is the real problem
Start by separating three things that often get mixed together: content scoring, authentication failure, and broader reputation. Razor2 belongs in the content scoring bucket. DMARC, SPF, and DKIM belong in the authentication bucket. IP and domain blocklist (blacklist) hits belong in the reputation bucket. One message can have problems in all three areas, but each area needs a different fix.
Razor2 content issue
- Signal: A content test or receiving filter reports a Razor2 rule hit.
- Root cause: Message body, HTML, links, footer, or copied content resembles reported spam.
- Fix: Change the message, remove questionable parts, then retest the exact send.
Domain or IP reputation issue
- Signal: A blocklist checker or receiving provider flags a domain or IP address.
- Root cause: Spam complaints, abuse traffic, compromised sending, or bad shared infrastructure.
- Fix: Stop the abuse, repair authentication, then follow the list's removal process.
Send one controlled test message, then inspect the full headers and spam scoring result. If the only meaningful negative result is Razor2, edit the content and test again. Remove external links, shorten the footer, replace copied HTML, and send a plain text variant. If the Razor2 score disappears after a content change, the message body was the trigger.
A SpamAssassin report showing a Razor2 rule hit for a test email.
Email tester
Send a real email to this address. Suped opens the report when the test is ready.
?/43tests passed
Preparing test address...
A test message is useful, but it only tells you about that sample. To understand whether the domain has been sending elsewhere, use DMARC aggregate reports. Suped's DMARC dashboard helps here because it groups sending sources, authentication pass rates, policy status, and issue detection in one place. For a broader check, the domain health checker can quickly show whether DMARC, SPF, and DKIM records have obvious problems around the same domain.
Suped DMARC dashboard showing email volume, authentication health, and source breakdown
The removal process that actually works
For Razor2 specifically, the honest answer is that you normally cannot force a delisting in the same way you can with many DNS blocklists. Because the data is distributed and based on reported content, a central "remove this domain" action is not the normal control point. The reliable path is remediation, retesting, and letting the bad content stop matching.
- Capture evidence: Save the tested message, full headers, sending IP, envelope sender, visible From domain, subject, and spam score details.
- Find the sender: Use DMARC aggregate reports to identify the server or service sending mail as the domain.
- Stop unauthorized mail: Disable forgotten apps, revoke stale SMTP credentials, patch forms, and remove old DNS includes.
- Rewrite the message: Change the body, footer, link layout, tracking redirects, and HTML structure that can match known spam.
- Retest in stages: Send a plain text version, then a minimal HTML version, then add parts back until the trigger is clear.
- Monitor recovery: Watch DMARC reports, complaint patterns, authentication failures, and blocklist status for the next sends.
Minimum DNS posture before retestingdns
_dmarc.example.com. TXT "v=DMARC1; p=none; rua=mailto:dmarc@example.com" example.com. TXT "v=spf1 include:_spf.example.net -all" selector1._domainkey.example.com. TXT "v=DKIM1; k=rsa; p=PUBLICKEY"
The DNS example above is not a complete policy recommendation for every domain. It shows the minimum idea: make sure DMARC reporting exists, SPF authorizes only real senders, and DKIM signs mail. If your SPF record has grown too large, hosted SPF and SPF flattening in Suped can keep the record inside lookup limits while still giving you a manageable sender inventory.
If you are dealing with a normal blocklist or blacklist at the same time, use a proper removal workflow after the cause is fixed. Suped's blocklist monitoring tracks domain and IP listings alongside authentication issues, which keeps Razor2-style content problems separate from true list-based reputation events.
How DMARC helps find the hidden sender
DMARC does not remove Razor2 hits, but it often gives you the missing operational answer: where did this mail come from? Aggregate reports show source IPs, sending organizations, SPF and DKIM match status, message volume, and policy disposition. When someone says a domain has not sent mail recently, DMARC is the record that proves or disproves it.
Example DMARC source split
A hidden sender often becomes obvious once DMARC aggregate reports are grouped by source.
Passed
Failed
Unknown
I usually look for four things in DMARC data. First, a sending source I do not recognize. Second, volume that conflicts with the team's belief about sending. Third, SPF or DKIM failures from a legitimate system that was never configured correctly. Fourth, a source passing authentication but sending content nobody owns anymore.
Where Suped fits
Suped's issue detection turns DMARC XML into source-level findings, alerts, and steps to fix. That helps when a Razor2 hit points to a forgotten server, because you need sender inventory, authentication status, and blocklist context in the same place.If you do not yet have DMARC reporting, add a reporting address first and wait for enough data to see real patterns. For a production domain, I avoid jumping straight to p=reject until legitimate sources pass SPF or DKIM with the right domain match. Hosted DMARC in Suped can simplify policy staging, especially when more than one team owns the sending stack.
DMARC checker
Look up a domain's DMARC record and catch policy issues.
?/7tests passed
What to change in the message body
Once you know the source, test content changes methodically. Do not rewrite everything at once and assume the issue is solved. Razor2 is fuzzy, so small changes sometimes make no difference, while removing a specific repeated block can change the result immediately.
- Start plain: Send a plain text version with the same sender and subject to separate HTML issues from copy issues.
- Remove reused blocks: Temporarily remove old signatures, disclaimers, tracking pixels, legal text, and copied footer sections.
- Simplify links: Replace long redirect chains, mixed domains, URL shorteners, and stale tracking domains with clean links.
- Change the template: Use fresh HTML, valid markup, and less boilerplate if the same template has been reused for years.
- Retest each version: Keep a simple log of which version triggered Razor2 and which version did not.
An infographic showing five content areas to check after a Razor2 hit.
If content changes clear the Razor2 result, keep the changed content in place and review the process that created the old version. If the same source keeps generating risky copy, fix the application, template library, or team workflow, not only the single email. A one-off template repair will not hold if automated systems keep injecting the same bad blocks.
When it is a real blocklist problem too
Razor2 can be the symptom that makes you investigate, but it is not the only thing to check. If the sending IP or domain is also on a domain or IP blocklist (blacklist), treat that as a separate reputation incident. A content fix will not remove an IP listing caused by compromised traffic, and a DNS delisting request will not fix a Razor2 body match.
This is where a broader blocklist guide helps, because each list has its own evidence, expiry behavior, and removal route. If the listing is not Razor2-specific, follow the list owner's instructions after the source is fixed. The sequence matters: fix first, request removal second, monitor third.
Blocklist checker
Check your domain or IP against 144 blocklists.
Spamhaus
0Spam
Cisco
NoSolicitado
URIBL
abuse.ro
ALPHANET
Anonmails
Ascams
BLOCKEDSERVERS
Calivent Networks
EFnet
JustSpam
Kempt.net
NordSpam
RV-SOFT Technology
Scientific Spam
Spamikaze
SpamRATS
SPFBL
Suomispam
System 5 Hosting
Team Cymru
Validity
www.blocklist.de Fail2Ban-Reporting Service
ZapBL
2stepback.dk
Fayntic Services
ORB UK
technoirc.org
TechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftSpamhaus0SpamCiscoNoSolicitadoURIBLabuse.roALPHANETAnonmailsAscamsBLOCKEDSERVERSCalivent NetworksEFnetJustSpamKempt.netNordSpamRV-SOFT TechnologyScientific SpamSpamikazeSpamRATSSPFBLSuomispamSystem 5 HostingTeam CymruValiditywww.blocklist.de Fail2Ban-Reporting ServiceZapBL2stepback.dkFayntic ServicesORB UKtechnoirc.orgTechTheftFor a step-by-step removal workflow, use how to get delisted only after you know whether the issue is a list-based reputation event or a content match. If mail is blocked by a receiver that mentions Spamhaus instead, the troubleshooting path is different; the page on Spamhaus blocking covers that case.
Blocklist monitoring page showing domain and IP checks across blocklists with importance and status
Views from the trenches
Best practices
Use DMARC reports first, because hidden senders often explain sudden Razor2 hits.
Test message variants one at a time so the exact matching content becomes visible.
Separate content scoring from true blocklist incidents before requesting removal.
Common pitfalls
Assuming Razor2 is a normal domain blacklist wastes time on the wrong fix path again.
Ignoring old apps leaves forgotten servers sending mail long after campaigns stop daily.
Changing DNS before finding the message body trigger can hide the real evidence.
Expert tips
Keep original headers and tested content samples before editing templates or servers.
Check authentication and source volume together, not as disconnected side tasks.
Treat repeated footers, redirect links, and copied HTML as likely content suspects.
Marketer from Email Geeks says a domain that appears unused can still have an old server or application sending meaningful volume.
2020-03-17 - Email Geeks
Marketer from Email Geeks says DMARC reports can reveal where the domain is being used when the sender is not obvious internally.
2020-03-17 - Email Geeks
The practical answer
Your domain is probably not "listed in Razor2" in the normal blocklist sense. A message associated with your domain is triggering Razor2 because its body resembles content reported as spam. The way out is to find the sending source, stop unauthorized or forgotten mail, change the content that is matching, and monitor the next sends.
If a real blocklist or blacklist listing exists as well, handle that separately after the cause is fixed. For Razor2, focus less on delisting and more on evidence: DMARC sources, headers, content variants, and sender controls. Suped is the best overall DMARC platform here because it keeps DMARC monitoring, hosted SPF, hosted DMARC, SPF flattening, alerts, blocklist monitoring, and deliverability checks connected instead of scattered across logs and inboxes.
