The Domain Spam Checker That Scans Any Domain.

Yes. The checker at the top of this page is free with no account, and one scan covers the whole domain: its blocklist status, MX presence, authentication posture, and spam score in a single pass. You do not spend a credit per address on the domain to learn whether the domain itself is flagged.

When you want the per-mailbox layer too, create a free account for 1,000 credits on the spot (2,500 if your signup email is a work address). Credits are pay-as-you-go, never expire, and volume pricing is shown for your region.

Nine checks run in parallel every time you scan a domain or an address on it, and for this keyword the domain-level ones matter most, so they lead: domain existence and MX record presence, email authentication records (SPF, DKIM, DMARC), domain age and registration history, disposable-domain match, catch-all domain detection, AI-confidence scoring on catch-all addresses, syntax and format validation (RFC 5321 / 5322), SMTP handshake and mailbox-exists ping, and role-address detection.

The verdict then folds public blocklist and DNSBL signals plus 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-signal breakdown: blocklist and DNSBL listings, MX record presence, the SPF, DKIM, and DMARC status line by line, catch-all and disposable signals, and domain age, all folded into one sender-reputation 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, and catch-all domains make it sneaky: 20-40% of B2B email lists fail at catch-all domains, where every address looks deliverable until the bounces land. 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. Every domain and address is processed in memory and discarded the moment the scan completes, never stored, logged, or sold. A domain's blocklist status and DNS records are public data, but which domains you are checking, your prospect lists, your competitors, your own portfolio, is competitive information, and it stays yours.

We're SOC 2 Type II compliant with the full Trust Center report on request. The privacy policyhas 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, and one scan per domain goes a long way. Most agencies and outbound teams hold somewhere between a handful and a few hundred sending and client domains, so the 1,000 free signup credits (2,500 with a work email) cover a typical portfolio many times over. Upload the domains as a CSV and the whole portfolio comes back scored in one pass.

Past the free tier, credit packs are pay-as-you-go and never expire, priced for your region, and bulk runs process at roughly 10,000 scans per minute through the API, fast enough to re-score a large domain list before every send window.

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.

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 a cron job that re-scores your domain portfolio on a schedule. Median latency runs around 380 ms per scan, sub-50 ms cached, so even a nightly sweep across hundreds of domains finishes in seconds, with live uptime at status.verifox.ai.

Verifox also ships native MCP server support so AI agents (Claude, Cursor, custom LLM apps) can screen a domain before drafting outreach from it, no glue code. Drop the MCP URL into your agent config and the tools are wired.