DNS Checker
Confirm SPF, DKIM, and DMARC are live and correct for any domain — a real-time DNS-over-HTTPS lookup, not a cached result.
Try it freeFree tools · No account
Every free deliverability tool we've built, in one place.
No email gate, no trial that expires — these are the same checks InboxStack Brain runs internally, released as standalone tools. Audit auth, check reputation, build records, and read DMARC reports without signing up for anything.
- 8 tools, one page
- No account, ever
- Most run entirely in your browser
Email Auditor
Paste headers or upload a .eml file for a 20-check deliverability audit covering auth, content, and infrastructure in one pass.
Try it freeWarmup Plan Builder
A day-by-day IP/domain warmup calendar with KPI gates, built from your actual domain age, DNS setup, and blacklist status.
Try it freeSPF Record Generator
Build a valid SPF record for Google Workspace, Microsoft 365, SendGrid, Mailgun, and more — with a live 10-lookup counter.
Try it freeDKIM Record Generator
Generate a DKIM keypair entirely client-side via the Web Crypto API. The private key never leaves your browser.
Try it freeDMARC Record Generator
A guided none → quarantine → reject rollout, with reporting addresses and alignment modes set correctly from the start.
Try it freeBlacklist Checker
Check a domain or IP against 6 major DNS-based blocklists at once, with direct removal links for anything that hits.
Try it freeDMARC Report Analyzer
Upload a DMARC aggregate report — .xml, .xml.gz, or .zip — and see every sending source in a readable table, not raw XML.
Try it free
Free tools check a point in time
Brain checks continuously, automatically.
Every one of these tools runs a manual, one-time check. InboxStack Brain runs them all continuously — auth, blocklists, DMARC reports, and reputation — and tells you the moment something changes.