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B2A Email Deliverability, MX, SPF & DMARC Verifier
B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from preflight.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-21).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX, SPF, and DMARC record checks to confirm deliverability.
Price / call$0.005
Success—
StatusUnknown
How this service works
Validates email syntax, disposable/burner provider status, role accounts, and live DNS MX/SPF/DMARC records. (Live x402 v2, IETF MPP & MCP endpoint at https://preflight.agentdiet.dev/v1/email-verify)
Output
Returns a structured object containing email syntax validity, whether the address belongs to a disposable or burner provider, whether it is a role account (e.g. info@, noreply@), and live DNS lookup results for MX, SPF, and DMARC records, collectively indicating whether the email is likely deliverable.
Example use cases
Screen signups for throwaway emails
“Before we add this new user to our CRM, check if signup@mailinator.com is a disposable or burner email address and whether its domain has working MX records.”
Validate B2B lead email before outreach
“I want to reach out to ceo@bigcorpinc.com — can you verify it's syntactically valid, not a role account, and that the domain has proper MX, SPF, and DMARC DNS records set up?”
Audit email domain DNS health
“We're seeing bounce rates spike for emails to clients on acmecorp.io — can you check the MX, SPF, and DMARC records for that domain by validating contact@acmecorp.io?”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/email-verify?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, single-call email hygiene check combining syntax validation, disposable provider detection, role account flagging, and live DNS MX/SPF/DMARC verification — especially in B2B lead enrichment, SaaS signup flows, or email campaign pre-flight workflows where deliverability confidence is critical. Prefer it over simple regex-only validators when DNS-level verification matters.
Side effects
- Malformed or missing email parameter returns a 400/422 validation error
- DNS lookup timeouts may cause MX/SPF/DMARC checks to fail or return inconclusive results
- Newly registered domains may have incomplete DNS propagation leading to false negatives
- Private or internal email domains may not resolve publicly
- Payment failure (HTTP 402) if x402 USDC balance is insufficient
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| emailrequired | string | Email address to validate for syntax, MX deliverability, and disposable risk |
Output
Schema · Response
{
"type": "object"
}Reviews
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