Stop landing in Spam.
Start closing in Primary.
The only deliverability cockpit that audits, fixes and proves inbox placement — in one signed-in workspace. SPF/DKIM/DMARC, 9 blacklists, AI subject lab, warm-up planner, and real-IMAP seed-list testing.
✓ No credit card on free plan · ✓ Cancel any time · ✓ Built on encrypted multi-tenant infra
97%
avg inbox placement after fixes
+38%
avg reply-rate lift
8 sec
to a full domain audit
9 DNSBLs
scanned in parallel
From red flags to Primary in 3 moves
STEP 01
Audit
Paste a domain. Live SPF/DKIM/DMARC/MX/BIMI/MTA-STS plus 10 blocklists in seconds.
STEP 02
Fix
Content analyzer rewrites the message, sanitizer ships sub-102KB HTML, subject lab tests 6 hooks.
STEP 03
Prove
Seed-list test sends to real Gmail/Outlook/Yahoo. IMAP poller reports the verdict in 2 minutes.
STEP 04
Guard
Inbox Guardian re-checks every domain daily and emails you the moment anything breaks.
Every module in the box
Seven coordinated tools, one verdict per send.
🛰️
Inbox Guardian 24/7
Daily SPF/DKIM/DMARC/MTA-STS + blocklist sweeps with instant alerts before a campaign hits spam.
🤖
AI Deliverability Copilot
Inbox probability, risk-by-risk fixes and a spam-safe rewrite with Gmail/Yahoo bulk-sender compliance.
🔬
Header Forensics
Paste headers from a spammed email: receiver verdicts, alignment, Microsoft SCL/BCL, hop delays.
📊
DMARC Report Analyzer
Turn rua XML into a source-by-source map of who sends as you, and when to go p=reject.
🧰
DNS Fix Wizard
Copy-paste SPF, DMARC, MTA-STS, TLS-RPT and BIMI records built for your exact ESP stack.
⚡
Content Analyzer
Spam-trigger scoring, link/image ratios, Gmail clip warnings, instant rewrite.
🧪
Subject Lab
AI-generated subject + preheader variants tuned for inbox, opens and CTR.
🛡️
Domain Authentication
SPF, DKIM, DMARC, MX, BIMI audited live over Cloudflare DoH.
🚨
Blacklist Scanner
Spamhaus, Barracuda, SpamCop, SORBS, PSBL, CBL, Mailspike, DBL, URIBL.
🧼
HTML Sanitizer
CSS inlining, 102KB Gmail clip check, dangerous-tag stripping, export.
🔥
Warm-up Tracker
35-day exponential ramp with engagement-cohort guidance per ESP.
📨
Seed-List Tester
Real Resend send to your seed mailboxes; mark inbox/promotions/spam.
Pricing that scales with your sending volume
$0 forever for solo senders. 7-day free trial on every paid plan.
Free
$0/mo
1 domain · 5 seeds/mo
Starter
$19/mo
3 domains · Subject Lab
Pro
$49/mo
10 domains · IMAP poller
Agency
$149/mo
Unlimited · White-label
Frequently asked
Is this really automated inbox-placement detection?
Yes. Connect any IMAP mailbox once in Settings. Every 2 minutes the poller reads each seed inbox and marks Inbox, Promotions or Spam. No 'mark manually' for connected mailboxes.
What email service does it send through?
Resend. Bring your verified sending domain and API key, we never hold your sender identity.
Do I need to be technical?
No. Plain-English guidance on every check, copy-pasteable DNS fixes, and the optimiser rewrites the email for you.
What about cold outbound?
Built for it. Warm-up tracker, subject lab and seed test were designed around real cold-outbound workflows.
Is there a free trial?
Free plan forever, and every paid plan starts with a 7-day free trial. Cancel any time from billing.
Where is my data stored?
Encrypted at rest. Seed-mailbox passwords use AES-256-GCM with a workspace-scoped key. RLS isolates every organisation.
Every email you send is either reaching Primary — or it isn't.
Stop guessing. Start measuring. Inbox Optimiz proves it.