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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 prompt-guard.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 domain 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://prompt-guard.agentdiet.dev/v1/spf-dmarc-auditor)
Output
Returns a structured object indicating email syntax validity, whether the domain is a known disposable/burner provider, whether it is a role account (e.g. info@, admin@), and live DNS lookup results for MX records (confirming mail server existence), SPF record presence and content, and DMARC policy record presence — collectively indicating whether the email is likely deliverable and domain security is configured.
Example use cases
Screen sign-up email before onboarding
“Before I create an account for this new user, can you verify that their email address signup@mailinator.com is legitimate — check if it's a disposable service and whether the domain actually has working MX records?”
Audit lead list email quality
“I have a sales lead with the email contact@prospectcorp.io — can you check if it's a role account, whether their domain has MX and DMARC records, and whether the address looks deliverable before we add them to our outreach sequence?”
Diagnose email deliverability issues
“We're having trouble getting replies from partners at notifications@bigclient.com — can you look up whether that domain has SPF and DMARC records properly set up, and confirm the MX records are there?”
Technical details
Endpoint
GEThttps://prompt-guard.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, single-call check covering email syntax, disposable/burner domain detection, role account classification, and live DNS MX/SPF/DMARC verification together. It is ideal for B2B lead qualification, sign-up fraud prevention, pre-send deliverability checks, and domain email security audits. Prefer it over simple syntax validators when DNS-level deliverability and anti-spam record checks are required.
Side effects
- Invalid or malformed email format returns a syntax error or validation failure flag
- Domain does not exist in DNS — MX lookup returns NXDOMAIN or empty result
- DNS timeout or resolver error causes lookup failure with a service error
- Ambiguous domains (e.g. newly registered) may return partial DNS results
- Disposable provider list may not cover every burner service, leading to false negatives
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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