The Domain Spam Checker That Scans Any Domain in 2 Seconds.

Yes. You can run 4 scans per day from this page without an account. No card, no signup.

Create a free account and you get 1,000 scans on the spot, or 2,500 if your signup email is a work address. After that, credits are pay-as-you-go and never expire on any paid plan, with volume pricing shown for your region.

Nine checks run in parallel every time you scan a domain or an address on it, scoring both the domain and the mailbox behind it:

• Syntax + format validation (RFC 5321 / 5322)
• Domain existence and MX record presence
• SMTP handshake and mailbox-exists ping
• Disposable-domain match
• Role-address detection
• Catch-all domain detection
• AI-confidence pass on catch-all addresses

The verdict folds blocklist signals and sender-reputation risk into one domain spam score, so a flagged domain reads as risky before you ever hit send. If you want the same scan focused on a single address, the email blacklist check runs the very same engine.

Paste the domain (or any address on it) into the field at the top of this page and run the scan. In about two seconds you get a domain spam score with the per-check breakdown: blocklist and DNSBL hits, MX and authentication posture, catch-all and disposable signals, and the overall sender-reputation read folded into one verdict.

A clean result means the domain isn't sitting on the blocklists we query and its signals look healthy. A risky or flagged result tells you exactly which signal tripped, so you can fix the cause before it costs you. For ongoing monitoring across a portfolio of domains, the API returns the same score on a schedule.

A domain or its sending IP lands on a spam list (a blocklist or DNSBL) when it trips a filter's thresholds: high bounce rates, spam-trap hits, sudden volume spikes, or recipients marking your mail as junk. Once a domain is listed, a large share of its mail quietly routes to the spam folder or gets rejected outright.

The single biggest controllable cause is sending to bad addresses. Scrub every list with a free email validator before each campaign and you starve the bounce-and-complaint loop that gets a domain flagged as spam in the first place. This checker shows you where the domain stands today; hygiene keeps it clean.

When mail from a custom domain lands in the spam folder, it is almost always a reputation problem, not a content one. The usual culprits are a domain or IP sitting on a blocklist, missing or misaligned SPF, DKIM, and DMARC, a cold domain sending at volume before it is warmed, or a history of bounces and complaints from a dirty list.

Verifox does not filter inboxes, so we can't move a message out of spam for you. What we do is surface the sending-side reputation and blocklist risk that drives the placement, so you can fix the root cause: delist the domain, fix authentication, warm slowly, and clean the list with an email verifier so only deliverable addresses ever enter your sending stream.

No. Domains and addresses are processed in memory and discarded the moment the scan completes. Nothing logged, nothing retained, nothing sold.

We're SOC 2 Type II compliant with the full Trust Center report on request. Read the privacy policy for the byte-by-byte breakdown of what we touch and what we don't.

Fix the root cause first, then request delisting. Most blocklists run a removal form on their site; the major DNSBLs delist automatically once the abusive pattern stops and your metrics settle. Submitting a removal while the domain is still sending to dead addresses just gets it relisted.

So the durable fix is hygiene: scrub every list with an email verifier before you send, warm new domains slowly, and keep bounce and complaint rates low. Verifox flags the risky addresses so they never enter your sending stream and re-list the domain.

Yes. The free tier gives you 1,000 scans (2,500 if you sign up with a work email), so this doubles as a bulk domain spam checker for most small portfolios outright.

For larger lists, our paid credit packs are pay-as-you-go and never expire, with pricing localized to your region on the pricing page. CSV upload, API access, and bulk parallel processing are included from the free tier up.

They answer two halves of the same question. An email verifier tells you whether a specific address is real and reachable; a domain spam checker tells you whether the domain behind it carries blocklist and reputation risk that will follow every message it sends. Verifox runs the identical nine-check engine for both and returns one verdict.

If you prefer the address-first phrasing, the email blacklist check scans a single address against the same blocklist and reputation signals. All three share the same accuracy, the same verification engine, and the same free tier.

Median latency is around 380 ms for a single scan, sub-50 ms for cached results. Bulk processing runs at roughly 10,000 scans per minute on the standard tier.

SLA is 99.9 % uptime on Starter, 99.99 % with an annual Volume contract. Full real-time uptime + incident history at status.verifox.ai. Implementation details in the API docs.

Yes. The REST API reference documents the inbound and outbound shapes for every endpoint, so you can drop real-time domain reputation and blocklist scoring into signup forms, CRMs, or any tool that speaks REST. HubSpot, Salesforce, Zapier, Klaviyo, Mailchimp, and Brevo all connect out of the box.

Verifox also ships native MCP server support so AI agents (Claude, Cursor, custom LLM apps) can screen domains without glue code. Drop the MCP URL into your agent config and the tools are wired.

Credits never expire and are refundable for the first 30 days from purchase, no questions asked. After 30 days, unused credits stay on your account permanently. Keep using them or transfer them to a teammate.

No subscription lock-in, no auto-renewals you have to fight to cancel. Full terms in the refund policy.