Check an Address, Inspect a Domain, Read Its Email Authentication
Every tool below is free and needs no account. They overlap on purpose — the same DNS answers several different questions — so the table underneath sorts them by the question rather than the feature.
Most email tools are named after the record they read, which is only useful if you already know which record you need. These are sorted by what you are trying to find out.
| Your question | Tool | You enter | You get |
|---|---|---|---|
| Does this email address actually exist? | Free Email Checker | Email address | Syntax, domain, MX, disposable and catch-all state for one address |
| Is this address even well-formed? | Email Syntax Validator | Email address | An RFC-level format check, with the rule that failed |
| Is this a throwaway address? | Disposable & Temporary Email Checker | Email address or domain | Whether the domain is in our disposable pool, and which provider runs it |
| Who is behind this address? | Email & Domain Enrichment | Email address | Company, website, social profiles and web tech stack where we hold them |
| Who hosts email for this domain? | Mail Server & MX Record Lookup | Domain | MX hosts in priority order, and the mail provider behind them |
| Can this domain receive mail at all? | Email Domain Checker | Domain | MX presence, provider, and our disposable / free / company verdict |
| Does this domain accept mail at every address? | Catch-All Email Detector | Domain | Whether the domain is accept-all, and why that makes verification inconclusive |
| Has this domain said who may send as it? | SPF Record Checker | Domain | Whether an SPF record is published, plus the provider it authorises |
| What does this domain tell receivers to do with fakes? | DMARC Record & Policy Checker | Domain | The DMARC record and its p= policy — none, quarantine or reject |
You have an email address and need to know something about it before you send to it or accept it at signup.
Syntax, domain, MX, disposable and catch-all state for one address
Email address →An RFC-level format check, with the rule that failed
Email address →Whether the domain is in our disposable pool, and which provider runs it
Email address or domain →Company, website, social profiles and web tech stack where we hold them
Email address →You have the part after the @ and need to know how — or whether — it handles mail.
MX hosts in priority order, and the mail provider behind them
Domain →MX presence, provider, and our disposable / free / company verdict
Domain →Whether the domain is accept-all, and why that makes verification inconclusive
Domain →Whether a domain has published the DNS records that stop other people sending mail as it.
The tools read live DNS, but the judgements — disposable, free, company, which provider runs this mail server — come from MailRook's own catalogue of email domains, built and re-checked continuously. It is browsable.
Every temporary-mail service we track, with the domains each one hands out.
Aliasing and relay services — deliverable, but not where the person reads mail.
Which domains answer on a given mail server, and how many of them are disposable.
The rules behind every verdict these tools return, written out in full.
Yes, and none of them need an account. Each has a daily limit per visitor. Signing up raises that limit and unlocks bulk checks and API access.
The free email checker. It runs syntax, domain, MX, disposable and catch-all checks together, so it is the right starting point unless you already know which one signal you need.
The domain checker answers whether a domain can receive mail and what kind of domain it is — disposable, free, company. The MX record lookup answers who runs the mail server, naming the provider behind the records. Same DNS, different question.
They tell you whether the domain can receive mail and whether the address is worth sending to. On a catch-all domain no tool can confirm an individual mailbox, because the server accepts every address by design. That limit is real, and no verification service escapes it.
Live DNS lookups for records like SPF, DMARC and MX, read against MailRook's own catalogue of email domains and the mail providers behind them. The classification rules are published in full on the methodology page.
Not with the free tools — they are deliberately one-at-a-time. Bulk checks run through email list cleaning, and the same signals are available per-request from the validation API.
The free tools take one address or one domain at a time. The API returns syntax, MX, disposable, catch-all, SPF, DMARC policy and a domain trust score for every address you send it — at signup, or across a list you already have.
What you unlock