Know your blacklist status before your recipients do
Pingovo runs a continuous IP blacklist check against 50+ DNSBL providers around the clock. The moment a blacklisting is detected, you're alerted with a step-by-step delisting guide.
50+
DNSBL providers monitored
<2 min
average alert time
24/7
automated monitoring
100%
free with every account
Blacklist Alert — Example notification
IP: 167.86.107.232 was listed on Spamhaus ZEN
Detected: 2 minutes ago · Reason: Outbound spam detected
Protect your sender reputation
Real-time monitoring
Your sending IPs are checked against 50+ DNSBL providers continuously, 24/7.
50+ DNSBL providers
Covers Spamhaus, Barracuda, SORBS, SpamCop, URIBL, and every major blacklist.
Instant alerts
Get notified by email the moment any of your IPs appear on a blacklist — with a direct delisting guide.
How blacklist monitoring works
Connect your sending IPs
Add your dedicated or shared IP addresses to the Pingovo dashboard in under a minute.
Automated checks run 24/7
Pingovo probes all 50+ DNSBL providers on a rolling schedule and records every result.
Get alerted instantly
If a listing is detected, you receive an email alert with the DNSBL name, reason, and delisting steps.
Follow the delisting guide
Each alert includes a provider-specific delisting guide to get you removed and back to inbox fast.
The blocklists that actually decide your delivery
A blacklist checker that returns a wall of green ticks across a hundred obscure zones tells you very little. Only a handful of lists are consulted by the mailbox providers your recipients actually use, and a listing on one of those is the difference between the inbox and a hard rejection at the SMTP door. These are the ones worth watching.
| Blocklist | Scope | What a listing means | Getting off it |
|---|---|---|---|
| Spamhaus ZEN | IP | The single most consequential listing. ZEN combines the SBL, XBL and PBL — spam sources, compromised machines, and IP ranges that should never send mail directly. | Self-service removal form; the underlying cause must be fixed first or it relists. |
| Spamhaus DBL | Domain | Your domain — not your IP — is implicated. Often triggered by a link in the message body rather than the sending host. | Self-service removal, after the offending content or redirect is taken down. |
| SpamCop | IP | Driven by recipient complaints. A listing usually means real people reported mail from that address as spam. | Expires automatically once complaints stop — typically within 24 hours. |
| Barracuda | IP | Fed by Barracuda appliances in front of a large share of corporate mail. A listing costs you business recipients specifically. | Removal request form, reviewed manually. |
| SORBS | IP | Several zones covering spam sources and dynamic ranges. Older and noisier than the rest, but still consulted. | Delisting request per zone. |
| CBL / abuseat | IP | Detects machines behaving like they are infected or proxying mail. Feeds Spamhaus XBL, so a CBL hit usually becomes a ZEN hit. | Self-service removal once the traffic pattern stops. |
| UCEPROTECT | IP | Lists aggressively, including entire neighbouring ranges at levels 2 and 3. Weighted lightly by most receivers for that reason. | Expires on its own; paid express removal exists and is generally not worth it. |
| SURBL / URIBL | Domain | Scan the URLs inside your message. A shortener or a tracking domain someone else abused can list you. | Removal request once the URL is clean. |
Why an IP blacklist check on its own is not enough
Most blacklist checkers take an IP address and stop there. But the two halves are scored separately: a domain blacklist entry lives against the name in your From header or the links in your body, and it will not show up on any IP lookup no matter how many zones that lookup covers. The failure mode is specific and confusing — every IP check comes back clean while delivery quietly collapses, because receivers are rejecting on the domain. Pingovo runs both checks: the IP zones above against your sending addresses, and the domain zones against the domains those messages carry.
Signals that arrive before a listing does
A blocklist entry is a lagging indicator — by the time it appears, the mail that caused it has already been delivered and complained about. Alongside DNSBL monitoring, Pingovo's sending infrastructure is watched through Google Postmaster Tools, which reports domain and IP reputation plus the user-reported spam rate for Gmail, and Microsoft SNDS, which reports complaint rates and spam-trap hits across Outlook and Hotmail. Those move first, which is what makes it possible to pull back before a listing lands rather than after.
One number you can act on, and the history behind it
A list of zone names tells you nothing on its own. Every sending address carries a reputation score out of 100 that falls with each listing it picks up, and lands in one of five bands — so "are we fine?" has an answer before anyone reads a single DNSBL name.
Each day's result is kept, so the score is a line rather than a snapshot. That is what separates a one-off listing that expired on its own from a slow slide that started three weeks ago — and it is the difference between reacting and knowing why.
Scores are recalculated on a rolling schedule, with a 90-day history retained per address.
Reputation bands
Last 14 days
Frequently asked questions
Pingovo checks your IPs against 50+ major DNSBL providers including Spamhaus ZEN, Barracuda, SORBS, SpamCop, URIBL, Invaluement, and more — covering virtually every list that mailbox providers use for filtering.
Pingovo scans on a rolling schedule and typically alerts you within minutes of a new listing being detected. You'll receive an email notification with the blacklist name, reason, and a direct delisting guide.
Each alert includes a step-by-step delisting guide specific to that blacklist provider. Most providers have a straightforward removal form, and listings are typically resolved within 24–48 hours.
Monitoring is passive — it doesn't impact your sending at all. It simply watches and alerts. If an IP is listed, Pingovo flags it and you can choose to pause sending from that IP while pursuing delisting.
Spamhaus publishes the blocklists that the largest share of mailbox providers actually query. ZEN is its combined IP list — spam sources, compromised machines and ranges that should not be sending mail directly — and DBL is its domain list. A listing on either is usually the difference between delivery and an outright SMTP rejection, where a listing on a smaller, noisier zone may cost you nothing at all.
Your domain. Domain blocklists like Spamhaus DBL, SURBL and URIBL score the name in your From header and the URLs inside the message body, and none of that shows up in an IP blacklist check. A link shortener or a tracking domain someone else abused is enough to get you listed, which is why Pingovo checks the domain zones as well as the IP zones.
It depends on the list. Spamhaus, CBL and SORBS take a self-service removal request, but relist if the underlying cause is still there — fix it first. SpamCop and UCEPROTECT expire on their own once the behaviour stops, usually within a day or so. Barracuda reviews requests manually. Every alert Pingovo sends names the list and links to the right removal route.
No. Complaint-driven lists can be triggered by a legitimate campaign to a stale list, spam-trap lists by a single recycled address, and UCEPROTECT will list an entire neighbouring IP range for a neighbour's behaviour. The listing is a signal to investigate, not a verdict — which is why verifying a list before you send and warming a new sender matter more than reacting afterwards.
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