# 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 status, role-account detection, and live DNS MX/SPF/DMARC record verification to assess deliverability risk.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/mx-deliverability-verifier?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-5206ddf9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_xuW02eDj3R_pnnkYM4tk4

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-5206ddf9
```

Example prompt: Can you check whether john.smith@acmecorp.com is a real, deliverable email address — specifically whether its domain has valid MX records, passes SPF and DMARC checks, and isn't from a disposable or burner provider?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email health check covering syntax, live DNS MX/SPF/DMARC records, and disposable/role-account detection together — rather than calling separate DNS lookup, SMTP ping, or email validation tools individually. Ideal for pre-campaign list hygiene, CRM data enrichment, and user signup screening where both DNS infrastructure and provider reputation matter.

## Known failure modes

- Invalid or malformed email address syntax returns a syntax error flag
- Domain with no MX records returns MX lookup failure
- DNS timeout for slow or unreachable domains may cause incomplete results
- Disposable provider list may not include brand-new burner services
- Network errors reaching DNS resolvers return service errors

## 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 belongs to a known disposable/burner provider, whether it is a role-based account (e.g. admin@, noreply@), and live DNS lookup results including MX record presence, SPF record content, and DMARC policy status — enabling a holistic deliverability risk assessment.

## 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-5206ddf9/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)