Catch deliverability problems
before you hit send
InboxPreflight runs your domain and messages through the same authentication and spam checks mailbox providers use — so your email lands in the inbox, not the junk folder.
Runs entirely in your browser. Your email content never touches our servers.
Everything between you and the inbox, checked
One dashboard for the authentication records, infrastructure and content signals that decide where your email lands.
SPF validation
Verify your SPF record exists, parses cleanly, and stays under the 10-DNS-lookup limit that silently breaks authentication.
DKIM lookup
Check DKIM selectors and confirm your signing keys are published and resolvable where receiving servers expect them.
DMARC policy analysis
See your DMARC policy the way Gmail and Microsoft see it — and get told exactly what "p=none" is costing you.
MX & infrastructure
Confirm MX records resolve and are ordered correctly, so replies and bounces actually make it back to you.
Header analyzer
Paste raw message headers and get a readable breakdown of authentication results, delivery hops and delays.
Preflight score
Every check rolls up into a single 0–100 score with prioritized, plain-English fixes — no deliverability PhD required.
Cleared for takeoff in three steps
No agents to install, no DNS changes to make before you can test.
Enter your sending domain
We query live DNS for your SPF, DKIM, DMARC and MX records — straight from your browser, over encrypted DNS.
Review your preflight report
Each record gets a pass, warn or fail — with the exact record value and what receiving servers will do with it.
Fix, re-check, send with confidence
Apply the suggested fixes, re-run the check in seconds, and watch your preflight score climb before your campaign goes out.
Simple pricing that scales with your sending
Start free. Upgrade when your volume — or your team — grows.
For anyone who wants to check a domain right now.
- Unlimited domain preflight checks
- SPF, DKIM, DMARC & MX validation
- Email header analyzer
- Runs 100% in your browser
For senders who live and die by inbox placement.
- Everything in Free
- Scheduled daily monitoring & alerts
- Inbox placement seed testing
- Blocklist monitoring across 50+ lists
- Historical reports & trends
For teams managing deliverability across many client domains.
- Everything in Pro
- Unlimited client domains
- White-label PDF reports
- Team seats & API access
- Priority support
Your next send deserves a preflight check
It takes 10 seconds to find out if your email is set up to land. Free, private, no signup.
Run your first check