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Grokzilla Email Deliverability Check
x402
Grokzilla Email Deliverability Check is a paid API for AI agents from grokzilla.shop, paid per call via x402, $0.0032/call, status unknown (last checked 2026-10-30).
Validates an email address for deliverability by checking syntax, canonical form, MX records, SPF, DMARC, and disposable domain status via DNS-over-HTTPS, returning a single verdict with reasons and sources.
Price / call$0.0032
Success—
StatusUnknown
How this service works
Check an email address for deliverability: syntax, canonical form, MX, SPF, DMARC, disposable domain. One verdict with reasons and sources. DNS-over-HTTPS only, no mailbox probing. Not charged if the DNS lookup fails.
Output
Returns a single deliverability verdict (pass/fail/unknown) with structured reasons covering syntax correctness, canonical email form, MX record presence, SPF record validity, DMARC policy, and disposable domain detection. Each finding includes the DNS source used. The request_id is echoed back for idempotency tracking. No charge is applied if the DNS lookup itself fails.
Example use cases
Pre-send email list hygiene
“Before I send this marketing email, can you check if 'signup@tempmail.org' is a real deliverable address or a throwaway — I need to know its MX status and whether it's a disposable domain?”
User onboarding email verification
“A new user just signed up with 'alice@nonexistent-domain.xyz' — can you verify if that email is actually deliverable and has valid MX and SPF records before we let them in?”
CRM data quality audit
“I have this email 'bob..smith@gmail..com' from our CRM — can you check the syntax and canonical form, and tell me if it would actually reach anyone?”
Technical details
Endpoint
POSThttps://grokzilla.shop/api/skills/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a lightweight, deterministic email deliverability check that covers DNS-level signals (MX, SPF, DMARC) plus disposable domain detection without performing mailbox probing (SMTP). Ideal for pre-send list hygiene, user registration flows, or CRM data quality checks where privacy and speed matter and you do not need SMTP-level confirmation. The no-charge-on-DNS-failure policy reduces cost risk for bulk checks.
Side effects
- DNS lookup failure — no charge applied, but no verdict returned
- Invalid email syntax input — rejected before DNS queries
- DNS-over-HTTPS provider timeout or unavailability
- Domain with no MX records returns a non-deliverable verdict
- Ambiguous or partial SPF/DMARC records may yield inconclusive results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| string | ||
| request_id | string | Optional idempotency key. Echoed back; a credit-pack redemption with the same request_id and body is charged once. |
Output
Schema · Response
{
"type": "json",
"example": {
"ok": true,
"data": {
"mx": [
{
"host": "gmail-smtp-in.l.google.com",
"priority": 5
},
{
"host": "alt1.gmail-smtp-in.l.google.com",
"priority": 10
},
{
"host": "alt2.gmail-smtp-in.l.google.com",
"priority": 20
},
{
"host": "alt3.gmail-smtp-in.l.google.com",
"priority": 30
},
{
"host": "alt4.gmail-smtp-in.l.google.com",
"priority": 40
}
],
"spf": {
"count": 1,
"record": "v=spf1 redirect=_spf.google.com",
"present": true
},
"dmarc": {
"p": "none",
"sp": "quarantine",
"pct": null,
"rua": true,
"record": "v=DMARC1; p=none; sp=quarantine; rua=mailto:mailauth-reports@google.com",
"present": true
},
"email": "jane.doe+news@gmail.com",
"local": "jane.doe+news",
"domain": "gmail.com",
"null_mx": false,
"reasons": [
"MX ok (gmail-smtp-in.l.google.com)",
"SPF ok",
"DMARC p=none"
],
"verdict": "deliverable",
"plus_tag": "news",
"canonical": "janedoe@gmail.com",
"disposable": false,
"implicit_mx": false,
"role_account": false,
"syntax_valid": true,
"domain_exists": true,
"free_provider": true,
"canonical_rule": "gmail: dots and +tag removed",
"mailbox_checked": false,
"mx_host_resolves": true
},
"next": [
"ip_intel"
],
"skill": "email_check",
"charged": true,
"service": "email_check",
"sources": [
{
"url": "https://cloudflare-dns.com/dns-query?name=gmail.com",
"name": "Cloudflare DoH",
"fetched_at": "2026-10-17T11:12:49Z"
},
{
"url": "https://github.com/disposable-email-domains/disposable-email-domains (CC0-1.0)",
"name": "disposable-email-domains",
"list_date": "2026-10-16",
"fetched_at": "2026-10-17T11:12:49Z"
}
],
"summary": "deliverable: MX ok (gmail-smtp-in.l.google.com), SPF ok, DMARC p=none",
"version": "1.0.0",
"warnings": [
"mailbox existence is not checked (no SMTP probing); a deliverable domain can still reject this mailbox"
],
"confidence": 0.85,
"data_as_of": "2026-10-17T11:12:49Z",
"generated_at": "2026-10-17T11:12:49Z"
}
}Tags
x402
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