# 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/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-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-080451d9
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_AYe9vhpRO8wyl6Yh9ge7r

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-080451d9
```

Example prompt: Can you check whether john.doe@acmecorp.com is a real, deliverable email — verify the syntax, confirm the domain has working MX records, and flag it if it's a disposable or role account?

## When to prefer this

Choose this endpoint when you need a real-time, multi-signal email validity check that goes beyond simple regex — especially when you want to simultaneously confirm DNS deliverability (MX), sender authentication setup (SPF/DMARC), and filter out disposable or role-based addresses in a single call. Ideal for lead enrichment pipelines, signup validation, and cold outreach pre-screening.

## Known failure modes

- Invalid or malformed email string returns a syntax error flag
- Domain with no MX records returns undeliverable status
- DNS lookup timeout for obscure or newly registered domains may return inconclusive results
- Disposable provider lists may not cover every burner service
- Payment failure (HTTP 402) if USDC micropayment is not processed correctly

## 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/spf-dmarc-auditor)

## Output

Returns a structured object indicating whether the email passes syntax checks, whether the domain belongs to a known disposable/burner provider, whether the local part is a role account (e.g. info@, support@), and the live DNS status of MX records (mail server reachability), SPF records (sender policy), and DMARC records (domain-based message authentication policy).

## 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-080451d9/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)