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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 presence.
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/mx-deliverability-verifier)
Output
Returns a structured object indicating email syntax validity, whether the domain belongs to a known disposable/burner provider, whether the address is a role account (e.g. info@, admin@), and live DNS lookup results for MX, SPF, and DMARC records — giving an overall deliverability assessment.
Example use cases
Scrub leads before email outreach
“Before I launch this cold email campaign, can you verify that michael.torres@acmecorp.io is a legitimate deliverable address — check syntax, MX records, and whether it's a role account or disposable email?”
Block burner emails at signup
“A user just tried to sign up with temp-mail123@guerrillamail.com — can you check if that's a disposable or burner email address so I can decide whether to block the registration?”
Audit domain email security posture
“Check the email address postmaster@startupxyz.com and tell me whether their domain has SPF and DMARC records properly configured — I want to know if they have basic email security in place.”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, single-call email health check that combines syntax validation, disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC record verification — especially in agent workflows requiring fraud prevention, lead quality scoring, or pre-send deliverability checks. Prefer it over simple regex validators when real DNS state matters, and over heavyweight email verification services when lightweight per-call micropayment pricing ($0.005) fits your cost model.
Side effects
- Missing or invalid 'email' query parameter returns a 400 error
- DNS lookup timeout if the target domain's nameservers are slow or unresponsive
- False negatives on newly created disposable domains not yet in blocklists
- Payment required (HTTP 402) if x402 USDC micropayment is not included
- Role-account detection limited to well-known prefixes; custom role aliases may be missed
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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