Blacklist Monitoring for IPs & Domains
Continuously check whether your mail server IPs and domains have been listed on DNS-based blacklists like Spamhaus, Barracuda, and SpamCop. Get alerted the moment a new listing appears so you can request delisting and protect your email deliverability.
Comprehensive Blacklist Monitoring Features
Everything you need to keep your sending reputation clean
Dozens of Blocklists
We query a broad set of major DNS-based blacklists (DNSBL/RBL) on every check, covering the lists that mailbox providers actually consult when deciding whether to deliver your mail.
IP & Domain Coverage
Monitor both your sending IP addresses and your domains, so you catch listings whether they target the host or the domain name itself.
Instant Listing Alerts
Get notified within seconds when a new listing appears, via email, Slack, Discord, and webhooks, so you can react before deliverability suffers.
Per-List Visibility
See exactly which blocklists flagged you and which came back clean, so you know how serious a listing is and where to file a delisting request.
Delisting Guidance
Each detected listing links to the responsible blocklist so you can investigate the reason and follow its delisting process without hunting for the right page.
Multi-Region Checks
Lookups run from multiple regions and are confirmed before an incident opens, so a transient DNS hiccup never pages you with a false listing.
Historical Reports
Review your listing history over time with clear timelines, perfect for spotting repeat offenders and proving a clean reputation to partners.
Flexible Scheduling
Set check intervals to suit how critical each sender is, and configure maintenance windows so planned work never triggers alerts.
Why Choose Our Blacklist Monitoring Solution?
A single blacklisting can silently wreck your email deliverability — messages land in spam or get rejected outright, and the damage to your sending reputation can linger for days. Our monitoring queries dozens of major DNS-based blacklists on a schedule and tells you the instant a new listing appears. With per-list detail and instant alerts, you can request delisting and fix the root cause before it costs you customers.
Check any sending IP address or domain
Coverage across dozens of major DNSBL/RBL blocklists
Per-list results so you know exactly who flagged you
Multi-region confirmation to eliminate false listings
Direct links to each blocklist's delisting process
Historical listing reports and timelines
Configurable check intervals per sender
Instant notifications via email, Slack, Discord, and more
How Blacklist Monitoring Works
Simple setup, continuous reputation protection
Add Your IP or Domain
Enter the sending IP address or domain you want to watch. Add as many as you need to cover every host and domain you send from.
Choose Your Schedule
Pick how often we check and which channels should receive alerts when a new listing is detected.
Monitor 24/7
We query dozens of DNS-based blacklists on your schedule, recording which lists flag you and which stay clean.
Get Instant Alerts
The moment a new listing appears, you receive an immediate notification with the offending list and a path to request delisting.
Blacklist Monitoring Use Cases
Essential for anyone whose business depends on email
Transactional Email
Password resets, receipts, and confirmations have to arrive. A blacklisting can send these critical messages straight to spam, so catching a listing early keeps your core flows working.
Marketing & Newsletters
Campaign performance collapses when your sending IP gets blocklisted. Monitoring protects open rates and revenue by alerting you before a listing tanks an entire send.
Self-Hosted Mail Servers
Running your own mail infrastructure means you own its reputation. Continuous blacklist checks let you spot a compromised or misconfigured server before providers start rejecting your mail.
Shared & Cloud IPs
On shared sending infrastructure, a noisy neighbor can get the whole range listed. Monitoring tells you immediately so you can react, escalate, or move to a clean address.
Frequently Asked Questions
Everything you need to know about blacklist monitoring
From our blog
Guides, deep-dives, and best practices from the WatchFor team
Ready to Protect Your Email Deliverability?
Join the teams who trust our platform to guard their sending reputation around the clock. Get started in minutes with our free plan — no credit card required.