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DKIM Postmark Selector Lookup
x402
DKIM Postmark Selector Lookup is a paid API for AI agents from dns.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Looks up and parses the DKIM public key for the 'postmark' selector (postmark._domainkey.<domain>) of a given domain via Cloudflare DoH, returning key metadata including type, length, testing flag, and revocation status.
Price / call$0.01
Success—
StatusUnknown
How this service works
DKIM public key for selector "postmark" of a domain: looks up postmark._domainkey.<domain> (TXT, Cloudflare DoH) and parses v=, k=, key type, public-key length, testing flag and whether the key is revoked (empty p=). Confirms that mail signed with the postmark selector will verify. $0.01 per lookup.
Output
Returns parsed DKIM TXT record details for the postmark._domainkey.<domain> DNS entry, including: the v= (version) tag, k= (key type, e.g. RSA), the public key itself, key length in bits, whether the domain is in testing mode, and whether the key is revoked (empty p= field). Also confirms whether mail signed with the postmark selector will successfully verify.
Example use cases
Verifying Postmark email deliverability setup
“We just set up Postmark for sending transactional emails from acme.com — can you check if the postmark DKIM selector is live and the key looks valid so we know mail will actually verify?”
Auditing domain email security posture
“I need to audit the email authentication setup for startup.io — can you check if their Postmark DKIM selector is configured, what key type and length it uses, and whether the key is revoked or in test mode?”
Diagnosing Postmark email signing failures
“Emails sent through Postmark from mycompany.com are failing DKIM verification — can you look up the postmark._domainkey DNS record and tell me if the key is missing, revoked, or has any obvious issues?”
Technical details
Endpoint
GEThttps://dns.intel.rallylive.ca/dns/dkim/postmark?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to verify or inspect the Postmark DKIM selector for a domain. Prefer this over generic DKIM lookup tools when the sending provider is known to be Postmark, as it targets the exact selector name and parses Postmark-relevant key metadata. Choose this over manual DNS queries when you need structured, machine-readable output including key length and revocation status.
Side effects
- Domain not found or has no DNS records — returns empty or NXDOMAIN result
- No postmark._domainkey TXT record exists for the domain — indicates Postmark DKIM not configured
- Revoked key detected (empty p= field) — key present but unusable for verification
- DNS resolution failure via Cloudflare DoH — transient network error
- Malformed TXT record that cannot be parsed — partial results returned
- Payment failure for the $0.01 USDC x402 fee — request not processed
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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