# B2A Email Deliverability, MX, SPF & DMARC Verifier

> B2A Email Deliverability, MX, SPF & DMARC Verifier is a paid API for AI agents from mcp-compiler.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 checks to assess deliverability.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/email-validator?utm_source=zero.xyz
- Price: $0.005/call
- Payment: MPP
- Status: unknown
- Last checked: 2026-10-21
- Activations on Zero: 0
- Provider: mcp-compiler.agentdiet.dev
- Website: https://mcp-compiler.agentdiet.dev
- Canonical page: https://www.zero.xyz/c/mcp-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9e7e6d01
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_j_QYjfwctb75_ZChf_U1U

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-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9e7e6d01
```

Example prompt: Can you check whether john.doe@example.com is a real, deliverable email address — specifically whether it 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 validation that combines syntax checking, disposable provider detection, role account flagging, AND live DNS record verification (MX, SPF, DMARC) in one response. Prefer it over basic regex validators when deliverability matters, or over simple MX checkers when you also need fraud/burner detection. Ideal for lead enrichment pipelines, user onboarding flows, and pre-send campaign hygiene where false positives are costly.

## Known failure modes

- Missing or invalid 'email' query parameter returns a validation error
- Domain does not exist in DNS — MX lookup fails with NXDOMAIN
- Temporary DNS timeouts may cause inconclusive MX/SPF/DMARC results
- Payment not fulfilled (HTTP 402) if x402 micropayment is not provided
- Rate limiting if too many requests are sent in a short window
- Ambiguous results for newly registered domains with incomplete DNS setup

## 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-compiler.agentdiet.dev/v1/email-validator)

## Output

Returns a structured assessment of the email address covering: syntax validity, whether the domain uses a disposable/burner email provider, whether it is a role-based account (e.g. info@, admin@), live DNS MX record lookup results, SPF record presence and content, and DMARC record presence and policy — giving an overall picture of whether the email is likely deliverable and trustworthy.

## 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-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-9e7e6d01/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from mcp-compiler.agentdiet.dev](https://www.zero.xyz/host/mcp-compiler.agentdiet.dev/llms.txt)