Is my domain blocklisted?
Find your real sending IPs and check them — and your domain — against the major email blocklists, live, in seconds. Nothing to upload.
Enter a domain and we find its real mail infrastructure from DNS — the IPs your SPF record authorizes to send (which set your reputation), your inbound MX servers (shown separately — they don't affect sending), and the domain itself — then query the major blocklists live and report which lookups actually succeeded. Enter an IP to check it directly. A listing is what quietly sends your mail to spam.
Blocklist FAQ
What is an email blocklist (DNSBL)?
It's a published, real-time list of IP addresses and domains known for sending spam or abuse. Mailbox providers check these lists on every inbound message; if your sending IP is listed, your mail can land in spam or be rejected before it's ever seen.
Could a blocklist be why my mail goes to spam?
Often, yes. A single listed sending IP is one of the most common silent causes of a deliverability drop. Because the check happens at the receiving server, you usually get no bounce that names the blocklist — which is why monitoring matters.
Why does it say it couldn't find my sending server?
DNS alone can't always tell which server actually sent a message. SPF lists who's authorized to send, but if your domain sends through a provider via an include: (a shared range), there's no single IP to check. To pin the exact sender, check its IP directly — you can read the connecting IP off a delivered message's headers, which our /headers Inbox Reality Check extracts for you.
How do I get removed from a blocklist?
Fix the underlying cause first — a compromised or misconfigured host, or a bad neighbor on a shared IP — then submit the list's removal request. Each listing above shows its severity, what it means, and a removal-form link. Delisting is usually quick once the cause is resolved; re-listing is likely if it isn't.
Which blocklists does this tool check?
Spamhaus ZEN, Spamhaus DBL, Barracuda, SpamCop. Spamhaus is the list most mailbox providers weight most heavily, so a Spamhaus listing is the most urgent to clear. We report a verdict as clean only when every list actually answered.
Do you upload or store my domain?
No. The check runs live over public DNS and nothing about your query is stored. If you want continuous coverage, you can optionally enroll a domain for free monitoring — that's the only path that keeps any state.