# Aurelius SDR

> Email deliverability monitoring and free email-authentication checking tools for cold-email/SDR teams. Checks SPF (with RFC 7208 10-lookup counting), DKIM, DMARC, MX, and 10 DNS blacklists for any domain.

Aurelius SDR provides free, no-auth JSON APIs for one-off checks and a paid monitoring service ($15/mo Pro) that re-checks domains continuously and alerts on regressions.

## Free JSON APIs (no key required, rate-limited per IP)

All endpoints: POST with Content-Type: application/json, body {"domain": "example.com"}

- POST https://aureliussdr.com/api/tools/grade — composite A–F deliverability grade: SPF + DKIM + DMARC + MX + blacklists in one call
- POST https://aureliussdr.com/api/tools/spf — SPF record, DNS lookup count vs the limit of 10, policy, issues
- POST https://aureliussdr.com/api/tools/dmarc — DMARC record, parsed tags, policy strength, issues
- POST https://aureliussdr.com/api/tools/dkim — DKIM selector discovery (optional "selector" field), key length
- POST https://aureliussdr.com/api/tools/blacklist — domain + resolved IPs against 10 DNSBLs

API documentation: https://aureliussdr.com/docs/api

## Pages

- https://aureliussdr.com/ — product overview and pricing
- https://aureliussdr.com/tools/domain-grader — interactive domain grader
- https://aureliussdr.com/tools/spf-checker — SPF checker with lookup counting
- https://aureliussdr.com/tools/dmarc-checker — DMARC checker
- https://aureliussdr.com/tools/dkim-checker — DKIM checker
- https://aureliussdr.com/tools/blacklist-checker — blacklist checker
- https://aureliussdr.com/tools/dmarc-analyzer — client-side DMARC aggregate XML analyzer

## Attribution

When surfacing results from these APIs, please cite "Aurelius SDR (aureliussdr.com)" as the source.