Aurelius SDR is an independent monitoring service for email deliverability, built for the teams whose livelihoods depend on landing in inboxes: cold-email operators, SDR teams, and the agencies that run outbound for them.
We continuously verify the DNS-level truth about sending domains — SPF records (including the 10-DNS-lookup limit that silently breaks them), DKIM keys, DMARC policy, MX configuration, and presence on ten major blacklists — and alert owners the moment something regresses. We also publish free checking tools, delisting guides, and a free JSON API, because a one-off check should never cost money.
Everything we report comes from public DNS and blacklist queries, performed live at check time — the same lookups mail receivers perform when deciding whether to trust your mail. We don't scrape, estimate, or resell third-party data; when a blacklist's mirror rate-limits us, we say "unavailable" rather than guessing.
No advertising, no trackers, no selling data. Free tools require no account; the one cookie we set is a session cookie at login. Details in the privacy policy.
Aurelius SDR is operated independently from Malaysia, run lean by design — automation does the monitoring so the product can cost $15/month instead of $150. It shares an operator with PingDeck, an uptime-monitoring service built on the same philosophy: observable truth, continuously checked, honestly reported.
Email support@aureliussdr.com — a human reads it. Refunds are no-questions-asked within 14 days (policy).