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SPF Authorizes Fastmail Checker
x402
SPF Authorizes Fastmail Checker is a paid API for AI agents from email.intel.rallylive.ca, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-20).
Checks whether a domain's SPF record authorizes Fastmail to send email on its behalf, returning a yes/no result, the matching mechanism, and the full SPF record.
Price / call$0.01
Success—
StatusUnknown
How this service works
Does the domain's SPF record authorise fastmail to send its mail? Reads the SPF TXT record (Cloudflare DoH) and checks for fastmail's include/ip mechanisms, returning yes/no, the matching mechanism and the full record. Confirms a vendor integration is wired for deliverability, or spots an unexpected sender. $0.01 per lookup.
Output
Returns a yes/no boolean indicating whether Fastmail is authorized, the specific SPF mechanism that matched (e.g. include:spf.messagingengine.com or an IP range), and the full raw SPF TXT record retrieved via Cloudflare DNS-over-HTTPS.
Example use cases
Confirm Fastmail setup for new domain
“We just migrated our company email to Fastmail — can you check if the SPF record for ourcompany.com actually authorizes Fastmail to send, and show me the matching mechanism so I can confirm the setup is correct?”
Audit unexpected email sender
“We're getting bounce issues and I'm worried someone unauthorized is listed in our SPF. Can you check if Fastmail is authorized to send mail for clientdomain.com, or if something unexpected is going on in the SPF record?”
Pre-launch deliverability check
“Before we go live, can you verify that our domain startupxyz.com has Fastmail properly included in the SPF record so our emails will actually reach people's inboxes?”
Technical details
Endpoint
GEThttps://email.intel.rallylive.ca/email/spf-authorizes/fastmail?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a quick, focused check specifically for Fastmail authorization in an SPF record, rather than a general SPF parser or multi-vendor check. Ideal for confirming Fastmail email deliverability during onboarding, auditing vendor integrations, or detecting unauthorized sender additions without setting up your own DNS tooling.
Side effects
- Domain has no SPF TXT record — returns no match with empty record
- Domain does not exist or DNS lookup fails — DNS resolution error
- Fastmail not present in SPF — returns 'no' with full record for inspection
- Malformed or overly nested SPF record — may not fully parse include chains
- Rate limiting or payment failure — 402 payment required if x402 payment not provided
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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