# 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, and DMARC record checks.

## Facts

- Endpoint: GET https://mcp-compiler.agentdiet.dev/v1/mx-check?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-cf4220fb
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Qq_Qh8QW21aXx5k68KKlR

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-cf4220fb
```

Example prompt: Can you check whether john.doe@tempmail.org is a real, deliverable email address — I want to know if it's disposable, whether the domain has valid MX and SPF records, and if DMARC is configured?

## When to prefer this

Choose this endpoint when you need a comprehensive, single-call email verification that combines syntax checking, disposable provider detection, role account identification, AND live DNS record validation (MX, SPF, DMARC) together. It is ideal for agent workflows that must qualify leads, gate signups, or validate outbound contacts before sending email, and where per-address micropayment billing ($0.005) is preferable to subscription-based alternatives.

## Known failure modes

- Missing or malformed email parameter returns a validation error
- DNS lookup timeouts may result in incomplete MX/SPF/DMARC results
- Domains with unusual or non-standard DNS configurations may return ambiguous results
- Payment failure (HTTP 402) if x402 micropayment is not completed
- Very new domains may not yet have DNS records propagated, leading to false negatives

## 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/mx-check)

## Output

Returns a structured object indicating whether the email passes syntax validation, whether the provider is flagged as disposable or burner, whether it's a role account, and the live DNS lookup results for MX, SPF, and DMARC records — giving an overall deliverability 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-compiler-agentdiet-dev-b2a-email-deliverability-mx-spf-dmarc-cf4220fb/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)