Every check, on every plan
One verification is twenty-eight measurements behind a single verdict. All of them run on every plan, including Free.
Input quality
Catching bad input before it costs a lookup.
Syntax validation
RFC-correct parsing of the local part and domain, quoted strings and internationalized mail included.
Typo suggestions
Did-you-mean suggestions for common misspellings of major providers, returned as data. We never silently change the address you submitted.
Gibberish screening
Keyboard-walk and random-string local parts flagged before they read as real people.
Domain intelligence
What the domain itself tells us.
MX records
Mail exchangers resolved and ranked, including implicit MX when no MX exists.
Null MX detection
Domains that declare they accept no mail (RFC 7505) are invalid without a connection.
Disposable domains
110,000+ throwaway providers, refreshed from two maintained lists.
Role addresses
info@, sales@, admin@ and friends, flagged so you can mail them differently.
Free providers
Gmail, Outlook and company identified, since free mailboxes behave differently in lists.
Parked and dead domains
Registrant placeholders and expired services identified by their DNS fingerprints.
DNS liveness
Dead DNS confirmed against an independent resolver before a domain is called invalid.
Mailbox proof
Talking to the server that actually answers for the address.
SMTP handshake
A real conversation with the responsible mail server, banners and reply codes classified per RFC 3463.
Provider overlays
Reply quirks read the way each operator means them: IronPort, Exim, GoDaddy, qmail and more.
Gmail and Google Workspace
Dedicated strategy with target-first probing and per-domain behavior profiles.
Microsoft
Consumer accepts are confirmed through Microsoft's GetCredentialType API before a valid verdict.
Yahoo and AOL
Verified through Yahoo's account-creation validation endpoint with browser-accurate TLS.
Apple, Proton, Zoho
Provider-specific response classes for iCloud, Proton and Zoho mail.
European ISPs
United Internet (GMX, WEB.DE, 1&1), T-Online, Orange, SFR and free.fr egress handled per their own rules.
Enterprise filters
Mimecast and Proofpoint front-ends recognized and answered accordingly.
Risk scoring
Turning measurements into a number you can automate against.
Catch-all scoring
Accept-all domains are measured with control probes; without proof of existence the verdict caps at risky.
Deliverability score
SPF, DKIM, DMARC and SpamAssassin-style content signals where they apply.
Spam-trap heuristics
Patterns associated with recycled and pristine traps weighted into the score.
Reputation signals
Blocklist presence for the domain and its mail servers.
Gravatar presence
A small but real signal that a human uses the address.
Typo risk
Likely-mistyped addresses scored down even when the typo happens to exist.
Run your first 300 checks free.
Same 28-check suite, no card required.