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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 determine real 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-check)
Output
Returns a structured object indicating whether the email passed syntax validation, whether the domain has live MX records capable of receiving mail, SPF and DMARC DNS record presence and validity, whether the provider is a known disposable or burner service, and whether the address appears to be a role account (e.g. info@, admin@).
Example use cases
Lead email screening before CRM import
“Before I import this list into our CRM, check if contact@acmecorp.io is a real deliverable email — does the domain have working MX records, and is it from a disposable provider?”
Signup fraud prevention for new registrations
“A new user just signed up with temp-mail123@guerrillamail.com — can you verify if that's a throwaway burner email and whether it would actually receive messages?”
Email authentication audit for a domain
“I'm trying to send outbound campaigns from our domain. Can you check if sales@mybusiness.co has proper SPF and DMARC records set up so our emails won't be rejected?”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, real-time email deliverability check that combines syntax validation, live DNS MX/SPF/DMARC record lookups, disposable provider detection, and role account flagging in a single call. Prefer it over simple regex or static blocklist tools when you need authoritative DNS-level confirmation that an email domain is actually configured to receive mail, especially for lead qualification, signup fraud prevention, or pre-campaign list hygiene.
Side effects
- Invalid or malformed email address provided — returns syntax error
- Domain has no MX records — email cannot receive mail, flagged as undeliverable
- DNS lookup timeout or transient failure — may return partial results or error
- Payment not processed (x402) — endpoint returns 402 Payment Required
- Rate limiting exceeded — returns 429 Too Many Requests
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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