Quick reference: Low-impact blocklists you may encounter
Many blocklist monitoring tools check dozens or hundreds of lists. Here's a quick reference for low-impact lists that occasionally appear in reports but rarely cause significant delivery problems.
Infrastructure-focused lists:
| List | Zone | What it checks |
|---|---|---|
| Gweep Proxy | proxy.bl.gweep.ca | Open proxy servers |
| Gweep Relays | relays.bl.gweep.ca | Open mail relays |
| Nether Relays | relays.nether.net | Open relays |
| IMP Spam | spamrbl.imp.ch | Spam sources |
| IMP Worm | wormrbl.imp.ch | Worm-infected hosts |
| dynip.rothen.com | dynip.rothen.com | Dynamic IP ranges |
| Tornevall | dnsbl.tornevall.org | Spam sources |
| Interserver | rbl.interserver.net | Spam sources |
| Efnetrbl | rbl.efnetrbl.org | IRC abuse/spam |
| Senderbase/**Talos** | senderbase.org | Cisco reputation data |
| Cobion/IBM X-Force | Various | IBM threat intelligence |
Regional/specialty lists:
| List | Zone | Focus |
|---|---|---|
| Korea Services | korea.services.net | Korean network ranges |
| RBL Japan Short | short.rbl.jp | Japanese spam list |
| RBL Japan Virus | virus.rbl.jp | Japanese virus list |
| Suomispam | bl.suomispam.net | Finnish spam list |
| Nordspam IP | bl.nordspam.com | Nordic region IP list |
| NoSolicitado | bl.nosolicitado.org | Spanish-language spam |
| Brukalai | black.dnsbl.brukalai.lt | Lithuanian blocklist |
| Virusfree bip | bip.virusfree.cz | Czech blocklist |
| Virusfree bad | bad.virusfree.cz | Czech blocklist |
| Metunet | rbl.metunet.com | Turkish blocklist |
| Jamessawyer | rbl.jamessawyer.co.uk | UK-based list |
General low-impact lists:
| List | Zone | Notes |
|---|---|---|
| S5h.net | all.s5h.net | Trap-based, auto-expire |
| Woody's Blacklist | blacklist.woody.ch | Spam sources |
| Fabel Spamsources | spamsources.fabel.dk | Danish trap network |
| Digibase | spambot.bls.digibase.ca | Spambot detection |
| Anonmails | spam.dnsbl.anonmails.de | Anonymous remailer abuse |
| TTK Singular | singular.ttk.pte.hu | Hungarian academic list |
| Truncate/gbudb | truncate.gbudb.net | Truncate network data |
| Spamlab | spamlab.tunk.org | Spam trap data |
| Bit | dnsbl.bit.nl | Dutch blocklist |
| Pedantic | pedantic.dnsbl.net | Strict policy list |
| Leadmon | rbl.leadmon.net | Spam sources |
| Junkemailfilter | bl.junkemailfilter.com | Spam filtering |
| spfbl | dnsbl.spfbl.net | **SPF**-based blocking |
| Suresupport RBL | rbl.suresupport.com | Hosting provider list |
| Redhawk | access.redhawk.org | Spam sources |
| Aupads Duinv | dnsbl.duinv.net | Spam sources |
| Aupads Orvedb | dnsbl.orvedb.net | Spam sources |
Advice for low-impact listings:
- Don't panic - these lists rarely cause widespread blocking
- Check if you have an actual infrastructure issue (**open relay**, missing PTR)
- Most auto-expire if the underlying issue is fixed
- Focus your energy on high-impact lists first
Not every flag on the horizon means danger. Some watchtowers serve tiny harbors - worth noting, but not worth losing sleep over while the major ports are clear.
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