# toolvend.dev Email Authentication Posture Check

> toolvend.dev Email Authentication Posture Check is a paid API for AI agents from toolvend.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-14).

Fetches and parses DMARC and SPF DNS records for a domain, scores email authentication posture 0-100, and returns findings with fix recommendations.

## Facts

- Endpoint: GET https://toolvend.dev/email-auth/:domain
- 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/toolvend-dev-email-authentication-posture-check-fde22863
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_c3ok4ay2HTzAMUSzURhsb

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 toolvend-dev-email-authentication-posture-check-fde22863
```

Example prompt: Can you check the email authentication posture for acme.com — fetch the DMARC and SPF records, score how well it's configured, and tell me what needs to be fixed?

## When to prefer this

Use this endpoint when you need a quick, structured, scored assessment of a domain's email authentication posture (DMARC + SPF) without setting up DNS tooling yourself. Prefer it over raw DNS lookups when you need parsed records, a normalized score, and human-readable fix recommendations in a single call. Ideal for security audits, deliverability diagnostics, and due diligence workflows.

## Known failure modes

- Domain does not exist — DNS resolution fails, no records returned
- Domain has no DMARC or SPF record published — score will be very low or zero with findings noting absence
- Malformed domain input — endpoint returns validation error
- Transient DNS resolution failure — intermittent error, retry recommended
- Private or internal domain that is not publicly resolvable

## 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 the parsed DMARC and SPF DNS records for the domain, a numeric posture score from 0 to 100, a list of findings describing configuration issues, and actionable recommendations to remediate those issues.

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/toolvend-dev-email-authentication-posture-check-fde22863/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from toolvend.dev](https://www.zero.xyz/host/toolvend.dev/llms.txt)