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.
Open the toolFree tools · No account
Your email is in spam. Start here, for free.
No email gate, no trial that expires. These are the same checks InboxStack Brain runs internally, released as standalone tools. Check SPF, DKIM and DMARC, see if you are on a blocklist, build the 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. Twenty checks across SPF, DKIM, DMARC, content, and infrastructure tell you why that email landed in spam.
Open the toolWarmup Plan Builder
A day-by-day IP/domain warmup calendar with KPI gates, built from your actual domain age, DNS setup, and blacklist status.
Open the toolSPF Record Generator
Build a valid SPF record for Google Workspace, Microsoft 365, SendGrid, Mailgun, and more — with a live 10-lookup counter.
Open the toolDKIM Record Generator
Generate a DKIM keypair entirely client-side via the Web Crypto API. The private key never leaves your browser.
Open the toolDMARC Record Generator
A guided none → quarantine → reject rollout, with reporting addresses and alignment modes set correctly from the start.
Open the toolBlacklist Checker
Check a domain or IP against 6 major DNS-based blocklists at once, with direct removal links for anything that hits.
Open the toolDMARC Report Analyzer
Upload a DMARC aggregate report — .xml, .xml.gz, or .zip — and see every sending source in a readable table, not raw XML.
Open the tool
New to this?
Start with your own domain.
Run a free audit and see exactly what is set up, what is missing, and what to fix first.