# 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 2026-10-21).

Validates an email address for syntax correctness, disposable/burner provider detection, role-account identification, and live DNS MX, SPF, and DMARC record checks.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/spf-dmarc-auditor?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-security.agentdiet.dev
- Website: https://mcp-security.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-a337299f
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_p4N7natVi4IkXii-2kxXz

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-a337299f
```

Example prompt: Can you check whether support@acmecorp.com is a real, deliverable address — including whether its domain has valid MX records, SPF, and DMARC set up, and whether it looks like a disposable or role-based account?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email validation that covers syntax, disposable provider detection, role-account flagging, and live DNS MX/SPF/DMARC record verification. Prefer it over simple regex-based syntax checkers when deliverability and domain security posture both matter, or over standalone MX lookup tools when you also need disposable/role account intelligence in one response.

## Known failure modes

- Invalid or malformed email address provided — returns syntax error
- DNS lookup timeout for the domain's MX/SPF/DMARC records — may return partial results
- Domain has no MX records (undeliverable domain) — reported as non-deliverable
- Payment not completed (HTTP 402) — request blocked until x402 USDC payment is made
- Empty email parameter — returns required field validation error

## 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/spf-dmarc-auditor)

## Output

Returns a structured object indicating email syntax validity, whether the domain uses a known disposable/burner provider, whether the address appears to be a role account (e.g. admin@, noreply@), and the live DNS MX records, SPF record presence/policy, and DMARC record presence/policy for the email's domain.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "email"
 ],
 "properties": {
  "email": {
   "type": "string",
   "minLength": 1,
   "description": "Email address to validate for syntax, MX deliverability, and disposable risk"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/mcp-security-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-a337299f/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-security.agentdiet.dev](https://www.zero.xyz/host/mcp-security.agentdiet.dev/llms.txt)