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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 2026-10-23).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX/SPF/DMARC record checks to assess 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 email syntax validity, whether the domain belongs to a known disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), and the live DNS lookup results for MX, SPF, and DMARC records — allowing the caller to assess overall email deliverability and quality risk.
Example use cases
Pre-signup email quality gate
“Before I allow this user to create an account with the email address signup42@mailnull.com, can you check whether it's from a disposable provider, verify the syntax is correct, and confirm the domain has live MX records so I know it's actually reachable?”
B2B lead list hygiene check
“I'm about to send an outreach email to a prospect at contact@startupxyz.io — can you verify that address is deliverable, not a role account, and that the domain has proper SPF and DMARC records set up?”
Marketing list deliverability audit
“We're cleaning our email list and I need to check whether newsletter@oldcompany.org is still deliverable — run a full DNS check including MX, SPF, and DMARC records and tell me if it looks like a real, functioning mailbox or if we should remove it.”
Technical details
Endpoint
POSThttps://preflight.agentdiet.dev/v1/email-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, multi-layer email validation that goes beyond simple syntax checking — combining disposable-provider detection, role-account flagging, and live DNS MX/SPF/DMARC lookups in a single call. Ideal for agent-driven onboarding flows, B2B lead enrichment pipelines, or pre-send deliverability checks where bad email quality would waste resources or damage sender reputation. Prefer this over basic regex validators or single-purpose DNS tools when you want a single authoritative pass/fail signal with full diagnostic detail.
Side effects
- Empty or missing email field returns a 400 validation error
- Malformed email that fails syntax check returns invalid syntax flag rather than performing DNS lookups
- DNS lookup timeouts for obscure or slow-responding domains may return incomplete MX/SPF/DMARC data
- Newly registered domains may not yet have propagated DNS records, leading to false negatives
- Disposable provider list may not cover every burner domain, allowing some to pass undetected
- Payment failure or insufficient balance returns HTTP 402 before any validation is performed
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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