{"uid":"cap_mQJinJIPwTBcn5_nb4m8o","slug":"email-spf-alignment-check-e83fa259","name":"Email SPF Alignment Check","description":"Email SPF Alignment Check: Email SPF Alignment Check checks relaxed or strict SPF domain alignment from bounded caller-supplied values without an external provider. Call Email SPF Alignment Check before accepting, caching, redirecting, or retrying a caller-supplied web response. Returns normalized web evidence, the computed finding, and an explicit pass or advisory status for Email SPF Alignment Check as versioned deterministic JSON. Price: $0.001 USDC via x402 on Base. First-party, stateless,…","url":"https://api.delx.ai/api/v1/x402/email-spf-alignment-check","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"mode":{"type":"string","maxLength":8192,"description":"Mode supplied to Email SPF Alignment Check; used only for this bounded calculation and processed in memory without retention."},"from_domain":{"type":"string","maxLength":8192,"description":"From Domain supplied to Email SPF Alignment Check; used only for this bounded calculation and processed in memory without retention."},"mail_from_domain":{"type":"string","maxLength":8192,"description":"Mail From Domain supplied to Email SPF Alignment Check; used only for this bounded calculation and processed in memory without retention."}}},"responseSchema":{"type":"json","example":{"result":{"mode":"relaxed","aligned":true},"schema":"delx/util-email-spf-alignment-check/v1","status":"pass","evidence":{"retained":false,"input_sha256":"ea586d1c403c2ce4bdabccfde8d16390a6f39bd162622d5aa8ca6b864aa2c9de","external_calls":0},"operation":"web_reliability:email_spf_alignment_check"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_f2legQCBvAGPUV_K5iR1j","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks relaxed or strict SPF domain alignment between the RFC5321 MAIL FROM domain and the RFC5322 From domain, returning a deterministic pass/advisory result.","exampleAgentPrompt":"Check the SPF alignment for an email where the From domain is example.com and the MAIL FROM domain is mail.example.com — use relaxed mode and tell me if it passes.","exampleUseCases":[{"title":"DMARC compliance check before sending","prompt":"I'm setting up DMARC for my domain acme.com and our transactional emails come from bounce.acme.com — can you run a relaxed SPF alignment check between those two domains to see if we'll pass?"},{"title":"Diagnosing SPF alignment failure","prompt":"Our DMARC reports show alignment failures for emails where the From domain is newsletter.company.com and the MAIL FROM is sendgrid.net — can you run a strict SPF alignment check on those two and tell me the finding?"},{"title":"Validating email pipeline before deployment","prompt":"Before we launch this email campaign, check relaxed SPF alignment between our From domain marketing.brand.io and our sending domain em.brand.io so I know we won't get flagged."}],"resultDescription":"Returns a versioned deterministic JSON object containing: normalized domain evidence for both input domains, the computed SPF alignment finding (pass or fail), and an explicit pass or advisory status. All processing is stateless and in-memory with no data retention.","failureModes":["Missing or malformed from_domain or mail_from_domain returns a validation error","Invalid mode value (not 'relaxed' or 'strict') may return an error or default behavior","Domains exceeding maxLength constraints may be rejected","Payment failure via x402 protocol will prevent endpoint access"],"whenToPreferThis":"Use this endpoint when you need a stateless, deterministic, first-party SPF alignment check without calling an external DNS resolver or email authentication service. It is ideal for DMARC policy enforcement pipelines, pre-send email validation, and diagnosing alignment mismatches between envelope and header sender domains. Prefer this over full DMARC evaluation tools when you only need the SPF alignment component in isolation.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T19:08:13.405Z","isFirstParty":false}