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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-check)
Output
Returns an object containing email syntax validity, whether the provider is a known disposable or burner service, whether the address appears to be a role account (e.g. admin@, support@), and live DNS lookup results for MX, SPF, and DMARC records on the email's domain — together providing a comprehensive deliverability and risk assessment.
Example use cases
Signup fraud prevention screening
“Before creating this account, check if the email address user123@tempmail.io is a real deliverable inbox or a disposable/burner address — I want to block throwaway signups.”
B2B outreach list hygiene
“I have a lead email address cto@startupxyz.com — can you verify that it's syntactically valid, the domain has working MX records, and SPF and DMARC are properly configured before I add it to my outreach sequence?”
Email infrastructure audit for a domain
“Can you check the email setup for the domain bigclient.com by validating whether it has live MX, SPF, and DMARC DNS records in place?”
Technical details
Endpoint
GEThttps://preflight.agentdiet.dev/v1/mx-check?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a single API call that combines email syntax checking, disposable/burner provider detection, role account flagging, and live DNS record validation (MX, SPF, DMARC) in one pass. It is particularly well-suited for B2B lead enrichment pipelines, signup fraud prevention, and pre-send deliverability checks where DNS-level verification is required, not just format validation.
Side effects
- Malformed or missing email parameter returns a validation error
- DNS timeout or unreachable nameservers may result in incomplete MX/SPF/DMARC results
- Newly registered domains may have no DNS records yet, causing false negatives
- Disposable provider lists may lag behind newly created burner services
- Payment failure via x402 returns HTTP 402 before the check 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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