# Email Authentication Posture Checker (DMARC + SPF)

> Email Authentication Posture Checker (DMARC + SPF) is a paid API for AI agents from x402-portfolio.x402iom.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Fetches, parses, and scores a domain's DMARC and SPF DNS records, returning a 0-100 posture score with findings and actionable fix recommendations.

## Facts

- Endpoint: GET https://x402-portfolio.x402iom.workers.dev/email-auth/:var1
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/email-authentication-posture-checker-dmarc-spf-e7eefe0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LiCtcVaHgZBSwFFKGwB-H

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 email-authentication-posture-checker-dmarc-spf-e7eefe0b
```

Example prompt: What's the email authentication posture for shopify.com? I need the DMARC and SPF records analyzed, a score out of 100, and any specific issues or fixes I should know about.

## When to prefer this

Use this endpoint when you need a quick, scored assessment of a domain's email authentication posture (DMARC + SPF) with human-readable findings and fix recommendations. It is ideal for security audits, pre-send deliverability checks, vendor due diligence, or identifying spoofing vulnerabilities. Prefer this over raw DNS lookup tools when you want interpreted results rather than raw record text.

## Known failure modes

- Domain does not exist or has no DNS records — returns error or empty findings
- DMARC or SPF record is absent — score reflects missing configuration
- Malformed DNS record that cannot be parsed — may return partial results
- Rate limiting or DNS resolution timeout — returns error
- Invalid domain format in path parameter — returns validation error

## How this service works

Email authentication posture for a domain: DMARC + SPF records fetched, parsed, scored 0-100, with findings and fix recommendations.

## Output

Returns parsed DMARC and SPF DNS records for the requested domain, a numeric posture score from 0 to 100 indicating overall email authentication strength, a list of specific findings (e.g. missing DMARC policy, overly permissive SPF), and actionable recommendations to remediate each issue.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/email-authentication-posture-checker-dmarc-spf-e7eefe0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402-portfolio.x402iom.workers.dev](https://www.zero.xyz/host/x402-portfolio.x402iom.workers.dev/llms.txt)