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Old Colony Web Mail Posture Lookup
x402
Old Colony Web Mail Posture Lookup is a paid API for AI agents from api.oldcolonyweb.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Queries public DNS records (MX, SPF, DMARC) for a domain and returns observed mail posture data with explicit unknowns and source names.
Price / call$0.003
Success—
StatusUnknown
How this service works
For $0.003 per domain: bounded public DNS MX, SPF and DMARC observations; explicit unknowns and source names. No mailbox, deliverability, spoofing-prevention or security-certification guarantee.
Output
Returns observed public DNS mail posture data for the domain, including MX record(s), SPF record, DMARC record, source names for each observation, and explicit 'unknown' markers where records are absent or unresolvable. Does not assess mailbox existence, deliverability, spoofing risk, or security certifications.
Example use cases
Pre-send domain mail record check
“Before I send a campaign to contacts at techcorp.io, can you pull the MX, SPF, and DMARC DNS records for techcorp.io so I know what their mail infrastructure looks like?”
Vendor email domain due diligence
“We're onboarding a new vendor and I want to verify their domain's mail posture — can you look up the public DNS MX, SPF, and DMARC observations for supplierco.com?”
Bulk domain mail posture audit
“I have a list of partner domains I need to audit for mail configuration — start by checking the DNS mail posture for partnerdomain.org so I can see its MX, SPF, and DMARC setup.”
Technical details
Endpoint
POSThttps://api.oldcolonyweb.com/v1/domain/mail-posture?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need lightweight, bounded public DNS mail record observations (MX, SPF, DMARC) for a single domain at low cost ($0.003), and explicit 'unknown' reporting matters. Prefer this over email preflight endpoints when you only need domain-level DNS posture, not mailbox or deliverability validation. Choose sibling batch endpoints when checking 2+ addresses at once.
Side effects
- Domain not found or unresolvable DNS — returns explicit unknown for affected record types
- Input is an email address or full URL instead of a bare hostname — rejected by schema validation
- Domain string exceeds 254 characters — rejected by schema
- Payment of $0.003 USDC not provided — 402 response returned
- Intermittent DNS resolution failure — partial results with unknowns flagged
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| domain | string | DNS hostname domain; not an email or URL |
Tags
x402
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