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Fastmail DKIM TXT DNS Record Lookup
x402
Fastmail DKIM TXT DNS Record Lookup is a paid API for AI agents from agentshelf.syntexa.ch, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-01).
Looks up the DKIM TXT record at the fastmail._domainkey.{hostname} DNS path for a given hostname
Price / call$0.008
Success—
StatusUnknown
How this service works
Call when an agent needs TXT at fastmail._domainkey.{hostname}. A different selector is a different DNS name. Exact $0.008 USDC. Prefer unpaid POST /v1/sandbox/dns-txt-dkim-fastmail first.
Output
Returns the TXT record value found at the fastmail._domainkey.{hostname} DNS path, which contains the DKIM public key or configuration string used by Fastmail for email authentication for that domain.
Example use cases
Verify Fastmail DKIM setup for domain
“I just set up Fastmail for my domain morningbloom.co — can you check if the DKIM TXT record at fastmail._domainkey.morningbloom.co is properly published yet?”
Debug email deliverability issues
“Our Fastmail emails for techstartup.io keep landing in spam — can you pull the DKIM TXT record at fastmail._domainkey.techstartup.io so I can see what's there?”
Audit DNS records across client domains
“I need to confirm the Fastmail DKIM record is in place for our client's domain designagency.net — fetch the TXT record at fastmail._domainkey.designagency.net please.”
Technical details
Endpoint
POSThttps://agentshelf.syntexa.ch/v1/dns-txt-dkim-fastmail?utm_source=zero.xyzWhen to prefer
Use this endpoint when you specifically need to retrieve the DKIM TXT record published under the Fastmail selector (fastmail._domainkey) for a given hostname — for example, to verify Fastmail email authentication is properly configured, to audit DNS records, or to debug email deliverability. Prefer the free sandbox version (POST /v1/sandbox/dns-txt-dkim-fastmail) first if available. If you need a different DKIM selector or a different mail provider's DKIM record, this endpoint is not appropriate.
Side effects
- No TXT record exists at the queried DNS name — returns empty or not-found response
- Invalid or malformed hostname input causing a DNS resolution error
- DNS timeout if the authoritative nameserver is slow or unreachable
- Hostname exceeds 253 characters — rejected by schema validation
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| hostname | string | Public DNS hostname such as example.com. Not a URL, not an IP literal, and not a private name. |
Tags
x402
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