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Lookproof MTA-STS Policy Parser
x402
Lookproof MTA-STS Policy Parser is a paid API for AI agents from api.lookproof.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-31).
Parses and validates a pasted MTA-STS policy file (RFC 8461) offline, checking version, mode, MX patterns, max_age, and flagging non-conforming lines or risky settings.
Price / call$0.002
Success—
StatusUnknown
How this service works
Check SPF, DMARC, DKIM, MTA-STS, DNSSEC and more, with results that explain what was found and why. Free browser checks and a pay-per-request API with x402.
Output
Returns the parsed fields of the MTA-STS policy: version string, mode (enforce/testing/none), list of MX host patterns, max_age integer, any lines that failed to parse, and warnings if the mode is 'testing' or 'none' or if max_age is unusually short. All processing is done offline without making DNS queries.
Example use cases
Pre-publish MTA-STS policy check
“Before I publish this MTA-STS policy, can you parse it and tell me if the version, mode, MX entries, and max_age all look correct, and flag any lines that won't parse? Here's the policy: 'version: STSv1\nmode: enforce\nmx: mail.example.com\nmx: mail2.example.com\nmax_age: 604800'”
Catching testing-mode risk before go-live
“I have an MTA-STS policy I'm about to deploy — can you check if it's still in testing mode or has a max_age that's too short? Policy text: 'version: STSv1\nmode: testing\nmx: smtp.mycompany.com\nmax_age: 300'”
Debugging a rejected MTA-STS policy
“My MTA-STS policy might have a syntax error causing sending servers to reject it — can you parse it line by line and tell me which lines don't conform to RFC 8461? Here's what I have: 'version: STSv1\nmode: enforce\nmx: *.mail.example.org\nmax_age: 31557600\nbadline: foo'”
Technical details
Endpoint
POSThttps://api.lookproof.dev/v1/mail/mta-sts-parse?utm_source=zero.xyzWhen to prefer
Use this endpoint when an agent or developer needs to validate or preview an MTA-STS policy file before publishing it to a web server, without making any DNS or HTTP requests to the live domain. Prefer it over live MTA-STS lookup tools when the policy isn't yet deployed, when you want offline/deterministic validation, or when you're generating or editing policy content programmatically.
Side effects
- Policy text is empty or exceeds 8192 characters — request rejected
- Policy has no parseable fields at all — returns empty parsed output with unparsed lines listed
- Network error reaching api.lookproof.dev — standard HTTP 5xx response
- Malformed JSON request body — HTTP 400 bad request
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| policy | string |
Tags
x402
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