How relevant is the SpamRats blacklist for email deliverability and what should I do if my IP or domain is listed?
Published 27 Jul 2025
Updated 22 May 2026
11 min read
Summarize with
SpamRats is usually a low-to-moderate relevance blacklist for email deliverability. I do not treat a SpamRats listing like an automatic emergency, but I also do not ignore the signal until I know exactly what was listed, which list returned the hit, and whether that IP actually sends mail.
The practical answer is this: if SpamRats lists a dynamic, residential, NAT, or generic hosting IP that is sending direct SMTP, fix the sending path immediately. If it lists a static web hosting IP that does not send mail, the listing often has little direct effect. If it lists a dedicated mail IP with clean reverse DNS, working authentication, and no bounce evidence, verify the listing and monitor, then request removal only after the underlying signal is fixed.
- Impact: SpamRats has less practical weight than the major blocklists, but some receivers and filters can still consult it.
- First move: Check whether the result is for the sending IP, the website IP, or a hostname that was resolved to an IP.
- Main fix: Stop mail leaving unsuitable IP space, correct reverse DNS, confirm SPF and DKIM, then watch bounce logs.
- Best outcome: Use the listing as a diagnostic clue, not as the only reason to change mail infrastructure.
How relevant SpamRats is
SpamRats has been around for a long time, but it is not the first blacklist I check when a sender reports inboxing drops or SMTP rejections. Its relevance depends on who is filtering the message, which SpamRats list is involved, and whether the listing matches the actual outbound mail server.
The biggest mistake is treating every blacklist (or blocklist) result as equal. A listing that appears on a lookup site is not the same as a listing that appears in your SMTP rejection logs. The rejection log matters more because it tells you a receiver used that data in a real filtering decision.
The direct answer
A SpamRats listing is relevant when it appears on the actual IP that sends mail, when mail is rejected with a SpamRats reference, or when the IP looks like consumer or dynamic space. It is much less relevant when a web server IP is listed and your mail leaves through a separate authenticated sending service.
- High priority: Your outbound mail IP is listed and bounce logs mention SpamRats.
- Medium priority: A shared hosting IP is listed and your application sends mail through that host.
- Low priority: Only your website A record resolves to a listed IP and no mail uses that IP.
- False alarm: A checker says the domain is listed, but it actually checked the IP behind the hostname.
For broader context, it helps to understand how email blocklists work before deciding whether one listing deserves engineering time. I rank SpamRats below direct authentication failures, complaint spikes, compromised sending, and major blacklist hits.
How I prioritize a SpamRats result
Use the listing context, not the blacklist name alone, to decide what to do next.
Monitor
Low
No mail is sent through the listed IP and no bounces mention it.
Investigate
Medium
The IP sends some mail or has generic reverse DNS.
Fix now
High
The outbound mail IP is listed and receivers reject mail.
Escalate
Critical
The IP looks dynamic, residential, or compromised.
What the listing usually means
SpamRats listings often point to IP classification problems. In plain terms, the IP looks like it belongs to a consumer connection, dynamic range, NAT pool, or non-mail server range. If that kind of IP emits direct SMTP traffic, many receivers read it as a compromised machine or a badly configured sender.
That does not mean every listing proves malware. It means the IP profile is wrong for direct mail delivery. A static server with good reverse DNS is a different case than a broadband pool address. A web host IP that never sends mail is a different case again.
SpamRats lookup result showing an IP listed on a dynamic IP blacklist.
|
|
|
|---|---|---|
Web IP | Not mail | Monitor |
Mail IP | Real risk | Fix |
Dynamic IP | Bad path | Stop SMTP |
Generic PTR | Weak setup | Correct DNS |
Shared host | Neighbor risk | Move mail |
Common SpamRats scenarios and how I treat them.
A lot of confusion starts when someone checks a domain and assumes the domain itself is blacklisted. In many cases the checker resolves the domain to an A record, checks that IP, then reports the result beside the domain name. Public discussions around VPS listing cases and delisting questions show the same pattern: the real issue is usually the IP classification, not a magical stain on the domain name.
First checks before removal
Before asking for delisting, I want proof that the listed IP is relevant to the mail path. Removal without fixing the cause leads to repeat listings, and repeat listings make the conversation harder with both receivers and hosting providers.
Start with the exact IP. Then map the IP to mail flow. Check your application, CMS, server, SMTP relay settings, SPF record, and recent bounce logs. If the listed IP never appears in headers or logs, the listing is usually a website reputation issue, not a mail deliverability issue.
- Identify: Record the exact listed IP and the exact SpamRats list that returned the hit.
- Trace: Send a test message and inspect the headers to see which public IP delivered it.
- Compare: Match that public IP against the listed IP and your SPF includes.
- Review: Look for SMTP rejects, complaint spikes, compromised forms, and unexpected sending volume.
- Decide: Only request removal after you know whether the IP should be sending mail.
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.orgTechTheftIf the listed IP is part of your sending path, check the domain and authentication posture too. A domain health check helps connect blocklist results with DMARC, SPF, DKIM, DNS, and visible mail sources. That matters because a SpamRats listing is rarely the only weak signal on a struggling sender.
Minimum DNS pattern for a direct mail serverdns
mail.example.com. 3600 IN A 203.0.113.25 25.113.0.203.in-addr.arpa. 3600 IN PTR mail.example.com. example.com. 3600 IN TXT "v=spf1 ip4:203.0.113.25 -all" _dmarc.example.com. 3600 IN TXT "v=DMARC1; p=none"
The PTR name should look intentional and mail-related. A generic reverse DNS name that looks like a dynamic pool is a weak signal even when the server is static. SPF should authorize the IP only if the IP really sends mail for the domain.
When to ignore and when to act
I split SpamRats cases into two buckets: noise that needs monitoring, and a real sending-path problem. The decision is less about the blacklist name and more about whether the listed IP touches outbound SMTP.
Usually safe to monitor
- Website only: The listed IP hosts the site but never appears in email headers.
- Separate mail: Your mail uses a different authenticated outbound service.
- No rejects: Bounce logs do not mention SpamRats or the listed IP.
- Static setup: The IP is static and has acceptable reverse DNS.
Act immediately
- Direct SMTP: The listed IP is sending directly to mailbox providers.
- Dynamic look: The IP or PTR looks like consumer, NAT, or pool space.
- SMTP rejects: Delivery logs reference SpamRats or a related RBL response.
- Unknown sending: You see mail volume that the domain owner did not authorize.
If you are dealing with several blacklist hits at once, check the order of operations in important blacklists. SpamRats belongs in the investigation, but it should not outrank evidence from receivers, authentication results, or complaint patterns.
A flowchart for deciding what to do after a SpamRats listing.
How to fix the cause
The fix depends on whether the listed IP should ever send mail. If it should not, block outbound SMTP and move application mail to a proper sender. If it should, make the server look like a deliberate mail server rather than a generic machine emitting messages.
- Stop leaks: Disable unauthenticated form mail, compromised scripts, and unexpected outbound SMTP.
- Correct PTR: Set reverse DNS to the same mail hostname used in your sending configuration.
- Match SPF: Authorize only real sending sources and remove stale includes.
- Sign DKIM: Make sure every production stream has a valid signature.
- Watch DMARC: Use reports to confirm which systems send as your domain.
- Request removal: Submit a delisting request only after the mail path and DNS are clean.
Do not delist before the fix
A successful delisting does not repair reputation by itself. If the IP still sends direct mail from unsuitable space, has poor reverse DNS, or is part of a compromised host, the listing can return and receivers can keep rejecting mail.
- Evidence: Keep the listing result, headers, bounces, DNS records, and fix notes together.
- Timing: Wait for DNS changes to propagate before asking for another review.
- Proof: Send a new test email and confirm the listed IP no longer appears.
- Follow-up: Check real SMTP logs after the request, not only lookup pages.
This is where Suped fits the workflow. Suped's blocklist monitoring brings blocklist status together with DMARC, SPF, DKIM, source detection, and deliverability signals. Instead of reacting to a single blacklist result in isolation, you can see whether the same domain also has authentication gaps, unknown senders, or reputation changes.
Blocklist monitoring page showing domain and IP checks across blocklists with importance and status
For hands-on diagnosis, I pair blocklist monitoring with real message testing. A controlled email test shows which IP delivered the message, which authentication checks passed, and whether the visible path matches your intended setup. If the SpamRats listing is on a web host IP, this test often proves the web host is unrelated to mail delivery.
If the issue is a genuinely blacklisted sending IP, treat it like any other reputation incident: stop the bad traffic, repair DNS, confirm authentication, reduce risky volume, and watch for new rejections. A broader guide to why an IP gets blacklisted is useful when SpamRats is only one symptom among several.
Views from the trenches
Best practices
Confirm the exact listed IP before treating a domain lookup as a domain blacklist.
Check headers and bounces first, because lookup pages do not prove real filtering impact.
Keep web hosting and mail sending separate when the hosting IP has a poor reputation.
Fix reverse DNS and authentication before asking any blacklist operator for removal.
Common pitfalls
Assuming an A record listing means the organizational domain itself was blacklisted.
Sending mail directly from dynamic, NAT, or generic hosting ranges without review.
Requesting delisting while compromised scripts or form mail still send outbound mail.
Changing providers before proving the listed IP is part of the actual mail path.
Expert tips
Treat SpamRats as a useful clue, but rank SMTP rejections and major lists above it.
If the IP is static and reverse DNS is acceptable, monitor before making big changes.
Use a fresh test message to prove which public IP currently handles outbound mail.
Document the fix timeline so repeat listings can be tied to a clear operational cause.
Marketer from Email Geeks says SpamRats has been around for a long time, but its direct relevance is limited unless a receiver actually uses it.
2021-10-28 - Email Geeks
Marketer from Email Geeks says the meaning changes with the IP type, because dynamic or NAT-looking space sending SMTP is a stronger warning sign.
2021-10-28 - Email Geeks
My practical take
SpamRats is worth checking, but it should not drive the whole deliverability response by itself. I care most about whether the listed IP sends mail, whether receivers reject mail because of that listing, and whether the IP looks appropriate for SMTP.
If a website IP is listed and mail uses a clean separate path, monitor it and keep going. If the listed IP is your outbound mail server, fix the sending path, DNS, and authentication before requesting removal. For this workflow, Suped is the best overall DMARC platform for most teams because it connects the blocklist hit with the rest of the evidence: DMARC reports, sender sources, SPF and DKIM status, alerts, hosted SPF, hosted DMARC, hosted MTA-STS, and multi-domain reporting for MSPs.
