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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 mcp-security.agentdiet.dev, paid per call via MPP, $0.005/call, status unknown (last checked 2026-10-28).
Validates an email address for syntax correctness, disposable/burner provider status, role account detection, and live DNS MX/SPF/DMARC record checks.
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://mcp-security.agentdiet.dev/v1/mx-deliverability-verifier)
Output
Returns a structured object indicating email syntax validity, whether the domain uses a disposable/burner email provider, whether the address is a role account (e.g. info@, admin@), live MX record lookup results, SPF record presence and validity, and DMARC policy status — providing a comprehensive deliverability and trustworthiness assessment for the given email address.
Example use cases
Pre-send campaign email validation
“Before we send out this marketing email blast, check whether sarah.jones@clientdomain.com is actually deliverable — does the domain have proper MX records, is it a disposable address, and does it pass SPF and DMARC checks?”
CRM lead quality screening
“I just got a new lead who signed up with the email temp123@mailinator.com — can you verify if this is a burner or disposable email, and whether it would actually receive mail?”
B2B outreach domain health check
“We're about to cold-email the contact at ceo@newpartner.io — can you verify that address is syntactically valid, not a role account, and that their domain has MX and DMARC records configured correctly?”
Technical details
Endpoint
POSThttps://mcp-security.agentdiet.dev/v1/mx-deliverability-verifier?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need a comprehensive, all-in-one email deliverability check that combines syntax validation, disposable provider detection, role account flagging, and live DNS record (MX/SPF/DMARC) verification in a single call. It is particularly well-suited for AI agent workflows that need to qualify email addresses before outreach, CRM ingestion, or user registration — especially when you want to avoid sending to spam traps, burner emails, or misconfigured domains without making separate DNS or reputation API calls.
Side effects
- Invalid or missing email parameter returns a 400 error
- DNS lookup timeouts for unresponsive domains may result in incomplete MX/SPF/DMARC data
- Newly registered domains may lack SPF/DMARC records, returning absent rather than invalid
- Payment failure (HTTP 402) if USDC payment is not completed
- Rate limiting or quota exhaustion may return 429 errors
- Malformed email strings that pass basic syntax but fail deeper checks may yield partial results
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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