About PSBL (Passive Spam Block List)
The Passive Spam Block List (PSBL) is a community-driven DNSBL maintained at psbl.org by Rik van Riel, populated entirely from spamtrap hits across the PSBL trap network. PSBL takes a deliberately conservative approach: only spamtrap-hit IPs are listed, and removal is intentionally simple and self-service. The list has been operational since 2004 and is one of the most operator-friendly DNSBLs in the industry — straightforward criteria, no payment angles, and a documented removal path.
A meaningful subset of Postfix, Exim, and SpamAssassin deployments include PSBL in default DNSBL chains. PSBL is less universally used than Spamhaus or Barracuda but appears in enough receiver configurations to be worth attending to. Listed mail is typically soft-failed (spam folder) rather than rejected at SMTP, because PSBL is usually one of several DNSBL signals receivers aggregate.
A direct hit on PSBL's spamtrap network. PSBL operates a large set of email addresses that are intentionally never used for legitimate purposes — any send to one of these traps lists the sending IP. Triggers for cold senders are almost always purchased or scraped lists that include trap addresses, or sending to recycled inboxes that became traps over time.
How To Get Delisted From PSBL (Passive Spam Block List)
- 1
Confirm PSBL listing via the lookup
Go to https://psbl.org/listing and enter your IP. The page confirms whether the IP is listed and shows when the last trap hit occurred. PSBL doesn't disclose the specific trap address but provides timestamps you can correlate with your sending logs.
Note: The lookup also has a 'remove' option directly on the same page — PSBL's UX is intentionally minimal.
- 2
Identify and clean the contaminated list
Trap hits come from sends to addresses that should never have been on your list. Audit your lead-data sources in the timeframe shown by the lookup — purchased lists are the most common source. If you can't identify the exact list, verify your entire active sending base through an email verification service before resuming any sending.
Note: PSBL listings often recur because trap addresses aren't usually one-off — they're sprinkled across the same contaminated list, so removing one trap doesn't fix the underlying list-quality problem.
- 3
Submit the self-service removal request
On the PSBL lookup page, click 'Remove'. The form asks for the IP, a contact email (used to confirm the removal — corporate email recommended over free webmail), and a brief reason. PSBL's removal is genuinely self-service — no manual review queue in most cases, no fees, no complex forms.
Note: If you've been listed multiple times, PSBL may require additional verification before allowing self-removal. The third or fourth removal request typically triggers manual review.
- 4
Wait for confirmation and propagation
PSBL removal typically processes within an hour. You'll receive an email confirmation, after which receivers refresh PSBL DNSBL data within 1-4 hours.
Note: PSBL is one of the faster DNSBLs to delist from. If removal doesn't process within a few hours, check whether your contact email matches what's on file with PSBL for previous removals.
- 5
Verify delisting and resume sending carefully
Re-run the PSBL lookup to confirm. Resume sending only after you've actually addressed the list-quality issue — PSBL operators have documented that the most common pattern is operators delisting, sending to the same contaminated list, and re-listing within hours. The fix is upstream of the listing.
Note: If you re-list within a week, PSBL flags the IP for closer monitoring and future self-removals may be denied.
- 6
Verify your active sending list
The durable fix is comprehensive list verification before sending. Use a verification service (Apollo's built-in, ZenVerifier, NeverBounce) to identify and remove invalid, role-based, and high-risk addresses. Drop scraped or purchased data sources entirely if you can't verify their origin and consent basis.
Note: ColdRelay's dedicated IP per-customer model isolates your trap exposure — but list quality is still on you.
Operational Details
Self-service removal: typically within 1 hour. Manual review (for repeat listings): 24-48 hours. Receiver-side DNSBL cache propagation: 1-4 hours after delisting.
Any new spamtrap hit attributed to the IP. PSBL's trap network catches sends to retired and never-active addresses; even one hit after delisting re-lists immediately.
Removal portal and questions: https://psbl.org. Operator background: https://psbl.org/about
PSBL (Passive Spam Block List) And Cold Email
PSBL is one of the more sender-friendly DNSBLs because the removal process is genuinely self-service and free — no payment angles, no opaque manual review. The trade-off is that listing criteria are strict: a single spamtrap hit lists you, and there's no ambiguity about why. For cold senders, PSBL listings are almost always a signal that your lead data is contaminated with trap addresses, usually from purchased or scraped sources. Fix the data and the listings stop. Shared infrastructure adds risk: when another tenant on your IP range hits traps, your IP gets listed even if your own sending is clean. ColdRelay's dedicated IPs per customer isolate trap exposure to your own sending. Combined with the 2-emails/day per-mailbox cap (which makes random trap hits statistically less likely), structural PSBL risk drops significantly.
Frequently Asked Questions
How long does PSBL delisting take?
Typically within 1 hour for self-service removal. PSBL is one of the faster DNSBLs to delist from — the process is genuinely self-service and automated for first-time listings. Repeat listings can trigger manual review with 24-48 hour turnaround.
Does PSBL charge for delisting?
No. PSBL is community-operated, free, and has no payment-based delisting paths. This is one of its reputational strengths — operators trust PSBL because there's no conflict of interest.
Why do PSBL listings keep recurring even after I delist?
Trap addresses usually exist on contaminated lists in clusters, not as isolated hits. Removing one trap from your CRM doesn't clean the rest. The fix is verifying your entire active sending base through a verification service and dropping data sources you can't trust. Without that, you'll re-list within days every time you resume sending.
Will PSBL tell me which trap address I hit?
No — PSBL doesn't disclose specific trap addresses (publishing them would defeat their purpose). The lookup shows timestamps for when the trap hits occurred, which you can correlate with your sending logs to identify the source campaign or list.
Is PSBL widely used by major mail receivers?
Less universally than Spamhaus or Barracuda, but PSBL appears in many Postfix, Exim, and SpamAssassin default DNSBL chains. The impact on Gmail and Microsoft 365 is smaller because they use proprietary reputation signals rather than direct DNSBL lookups; the impact at enterprise on-prem servers and mid-market hosting is more meaningful.
How can I prevent recurring PSBL listings?
List quality. Verify before sending, drop scraped or purchased data, remove never-engaged contacts from your active sending pool, and watch for high-bounce or zero-engagement segments — those are the lists most likely to contain traps. Combined with dedicated infrastructure that isolates your trap exposure, recurring listings stop.
Does ColdRelay infrastructure prevent PSBL listings?
Structurally for the shared-infrastructure risk: dedicated IPs per customer mean only your own sending affects your IP's trap exposure. The 2-emails/day per-mailbox cap also keeps random-hit probability low. List quality is still your responsibility — if your lead data is contaminated, no infrastructure prevents traps.