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Polyform Email Domain Deliverability Check
x402
Polyform Email Domain Deliverability Check is a paid API for AI agents from polyform.polyform-org.workers.dev, paid per call via x402, $0.003/call, status unknown (last checked 2026-09-14).
Checks whether a domain can receive email by querying MX, SPF, and DMARC DNS records via DNS-over-HTTPS and returns a structured deliverability summary.
Price / call$0.003
Success—
StatusUnknown
How this service works
Can this domain receive mail, and is it configured seriously? MX, SPF and DMARC via DNS-over-HTTPS with a deliverability summary. JSON.
Output
A JSON object containing the results of DNS-over-HTTPS lookups for the domain's MX records (mail server presence), SPF record (sender policy), and DMARC record (authentication policy), along with an overall deliverability summary indicating whether the domain is seriously configured to receive email.
Example use cases
Pre-send email validation for outreach
“Before I send my cold outreach campaign to leads at techstartup.io, can you check if that domain actually has MX records and a valid SPF/DMARC setup so I'm not emailing a dead domain?”
Vendor onboarding domain verification
“We're about to set up an integration with a new vendor at partnerfirm.co — can you verify their domain is properly configured to receive email before we send them credentials?”
Fraud detection on user signup
“A user just signed up with an email at quickmail247.net — can you check if that domain has legitimate MX, SPF, and DMARC records configured, or if it looks like a throwaway domain?”
Technical details
Endpoint
GEThttps://polyform.polyform-org.workers.dev/v1/email/domain-checkWhen to prefer
Choose this endpoint when you need a quick, structured assessment of whether a domain is configured to receive email, combining MX presence, SPF policy, and DMARC authentication in a single call. Ideal for pre-send validation, lead enrichment, fraud detection, or vendor onboarding workflows where you need to know if emailing a domain is likely to succeed and whether the domain operator takes email security seriously.
Side effects
- Domain does not exist or is not registered — returns no records found
- Domain has no MX records — deliverability summary flags it as non-mail-receiving
- DNS-over-HTTPS resolver timeout or upstream failure — may return error or empty response
- Malformed domain input — may return validation error
- Domain exists but has partial email configuration (e.g. MX present but no SPF/DMARC) — summary reflects degraded configuration
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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