# 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, and DMARC record checks.

## Facts

- Endpoint: GET https://mcp-security.agentdiet.dev/v1/email?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-ea7eaf3a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_S9oVnrk5yBgNqSv9Vv4K_

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-ea7eaf3a
```

Example prompt: Can you verify whether john.doe@acme-corp.com is a real, deliverable email address — check if the domain has valid MX records, whether it's from a disposable provider, and whether SPF and DMARC are set up?

## When to prefer this

Choose this endpoint when you need a comprehensive, multi-layer email validation that combines syntax checking, DNS MX reachability, disposable provider detection, and SPF/DMARC record inspection in a single call. Ideal for B2B lead qualification pipelines, user registration flows, and pre-send outreach verification where deliverability and trust signals all matter. Prefer over basic regex-only validators when live DNS checks and security record validation are required.

## Known failure modes

- Invalid or malformed email input returns a syntax error or 400-level response
- DNS lookup timeouts for domains with slow or unreachable nameservers may result in incomplete MX/SPF/DMARC data
- Very new domains may lack MX/SPF/DMARC records even if legitimate
- Payment required (402) if USDC micropayment via x402 is not completed
- Rate limiting or quota exhaustion may return 429 errors
- Domains using non-standard or private DNS resolvers may yield inconclusive results

## 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/email)

## Output

Returns structured data indicating email syntax validity, whether the domain is from a known disposable/burner provider, whether it appears to be a role account (e.g. info@, admin@), live DNS MX record presence and details, SPF record content, and DMARC policy record — together forming a comprehensive deliverability and trust 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-ea7eaf3a/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)