Step 01
Connect your ESP in 5 minutes
Plug in your ESP via API or webhook. Brain starts pulling live performance signals immediately and establishes your baseline across every MBP.
From $49/mo — 14-day free trial, no card
Know why your inbox rate dropped — in 4 minutes, not 4 days.
InboxStack Brain connects to your ESP, runs anomaly detection across Gmail, Outlook & Yahoo, and traces every drop to its exact cause — so you fix it fast instead of guessing.
How It Works
From first signal to final fix — automatically
No log diving. No spreadsheet exports. No deliverability consultant on retainer. Brain handles the diagnosis end-to-end.
Step 02
Brain detects & diagnoses
When a signal deviates, the RCA Inspector automatically builds a causal graph. Authentication failures, reputation events, and provider-specific rejections map to a clear verdict in under 4 minutes.
Step 03
A specific fix — not a checklist
The Resolution Center translates the causal graph into a prioritized playbook built for your exact situation. Execute the fix — Brain confirms the recovery.
The Problem
The old way of monitoring email is broken
Most tools tell you something is wrong. They show you a red light. No context. No cause. No plan. No fix.
Your inbox rate crashed 22% and you had no idea until Monday
Most platforms flag failures hours or days after they begin — by then, the damage is done.
You know something is wrong. You don't know what. Or why.
Without causal context, every investigation is a shot in the dark costing days of engineering time.
Gmail says one thing. Outlook says another. Yahoo says nothing.
Each provider rejects for different reasons — fixing one without knowing the cause can make the others worse.
Generic advice that doesn't apply to your specific situation
Advice disconnected from your actual infrastructure and sending history helps no one.
The Solution
One platform. Three jobs. Zero guesswork.
InboxStack Brain covers every phase of your deliverability workflow — before you send, when something breaks, and every day in between.
Before a Campaign
Pre-send confidence — every domain, every send.
What's included
- Pre-send seed testing across Gmail, Outlook & Yahoo inboxes
- Full domain health check: SPF, DKIM, DMARC, BIMI
- Authentication audit with pass/fail diagnosis
- Sending infrastructure fingerprint before every blast
During a Problem
Anomaly to root cause to fix in under 4 minutes.
What's included
- ML Signal Engine detects anomalies before inbox rates move
- Incident Intelligence classifies severity automatically
- RCA Inspector traces the exact causal chain behind every failure
- AI-generated resolution playbook tailored to your exact incident
Every Day
Hands-off hygiene that runs while you sleep.
What's included
- Blacklist monitoring across 50+ lists (daily, not weekly)
- DMARC report parsing and policy monitoring
- Google Postmaster & Microsoft SNDS tracked automatically
- Sender Score & IP reputation snapshots every 24 hours
Connectors & data sources
Your ESP. Postmaster. DMARC. All in one feed.
Brain pulls real performance data from your ESP — not the estimates competitors run on. Then we layer in Google Postmaster, Microsoft SNDS, DMARC reports, DNS audits, and 50+ blocklists. Every diagnosis runs on full evidence.
- Google Postmaster
- Microsoft SNDS
- DMARC Reports
- DNS Audit
- 50+ Blocklists
See it in action
Plug Into Your ESP. Intelligence Starts Flowing in Minutes.
Signal Engine LIVE
24h 7d 30d
Inbox rate
94.2%↑ 2.1
Spam folder
3.1%↑ 0.4
Complaint
0.08%↓ 0.02
DMARC pass
99.6%↑ 0.1
Signal Engine
Know about reputation problems before your campaign does
Real-time anomaly detection across every send. Brain classifies the deviation, traces the causal chain, and surfaces the exact fix.
Daily Monitor LIVE
Yahoo dip detected · stream_promo
Daily Monitoring
Per-provider delivery rates. Every day. Automatically.
Gmail, Outlook, and Yahoo broken out separately — per IP, per domain, per stream. Catch a Yahoo-only drop before anyone files a ticket.
War Room LIVE
acme.com
94.2%
newsletters.acme.com
96.1%
shop.acme.com
92.8%
alerts.acme.com
99.6%
Brain Intelligence
One command center. Every domain. Every incident. Live.
Multi-domain senders stop pivoting between dashboards. Every sending identity in a single live view, prioritized by revenue impact.
Pre-send Test READY
Gmail
Inbox
14 / 15
Outlook
Inbox
12 / 15
Yahoo
Promotions
9 / 15
Apple
Inbox
15 / 15
87% predicted inbox rate
Pre-send Seed Testing
Know your inbox rate before you hit send
Drop your draft into Brain. We seed-test across Gmail, Outlook, Yahoo, and Apple in seconds — and tell you exactly which providers will reject it before your audience does.
RCA Inspector LIVE
Causal chain · incident #4821
! Content fingerprint change detected
! Spam corpus pattern match
✓ SPF alignment
✓ DKIM & DMARC
Top hypothesis 87% conf.
Content trigger — revert template tmpl_3f2a or rephrase CTA block
Root Cause Analysis
Brain tells you why — with evidence, not guesses.
Every diagnosis cites the signals it's based on: header changes, auth deltas, content fingerprints, list churn, IP warmup state.
<4 min
Average time from anomaly detection to root cause
50+
Blacklists monitored daily across all domains
8 ESPs
Native connectors: Mailchimp, SendGrid, SES, Brevo & more
22 yrs
Combined deliverability experience encoded in the Brain engine
Customer Results
See what serious senders say about Brain.
Not generic praise — specific incidents caught and resolved.
Optin Secure
InboxStack Brain flagged a reputation issue before it hit inbox rates. The RCA Inspector pointed straight to the problem and we fixed it the same morning — without paging an engineer.
Campaign Studio
The Causal Graph shows us exactly what broke and why. Our clients see better inbox rates and we spend far less time firefighting deliverability across the agency portfolio.
Orbosys
The Signal Engine caught an SPF issue that was silently tanking our Outlook delivery — we'd never have spotted it ourselves. Brain told us why it was happening and exactly what to fix.