Email Analytics & Deliverability Measurement
Learn how to measure inbox placement rate, domain reputation, spam rate, and the metrics your ESP doesn't show you. Data-driven guides from InboxEagle.
Analytics12 min
Salesforce Email Deliverability: The Complete Guide (2026)
Everything that decides whether Salesforce emails reach the inbox: the Deliverability access level, SPF, DKIM and DMARC, Marketing Cloud sending domains and IPs, bounce management, daily limits and spam fixes.
Analytics8 min
HubSpot Email Deliverability: The Complete Guide (2026)
Everything that decides whether HubSpot emails reach the inbox: authentication, IPs, bounces, list hygiene, Sales Hub Sequences and the bulk sender rules, with the fix for each.
Analytics13 min
Mailchimp Deliverability: Why Emails Miss the Inbox and Fixes
Mailchimp deliverability problems rarely start inside Mailchimp. They start in your domain, your list and your sending history. Here is how to diagnose why campaigns land in spam or Promotions, what to fix first, and what to do after a list or domain change.
Analytics16 min
Why Are My Emails Going to Spam? 12 Ways to Fix It
Why emails go to spam and how to fix it — 12 systematic checks covering authentication, sender reputation, bounces, complaints, audience quality and inbox placement, plus how InboxEagle helps you investigate.
Analytics3 min
Bot Clicks in Klaviyo: How to Find and Filter Them
Security software clicks the links in your emails before a person does. Klaviyo records those clicks, and unless you filter them they flow into your segments, splits and attribution.
Analytics3 min
Bounce Rate vs Complaint Rate: Which Hurts More
Bounces mean the server did not accept the mail. Complaints mean a person marked accepted mail as spam. Which one is more dangerous depends on the provider measuring it.
Analytics4 min
Email Content Signals vs Sender Reputation
InboxEagle's Q1 2026 content studies did not show trigger words, image ratio, or link count causing spam. Complaint rate and list quality did the work. This page cites those studies and does not add a new dataset.
Analytics3 min
Email Deliverability Postmortem Template
After the first 24 hours, write down which provider moved, what you ruled out, and how you will know the fix held. Here is a short postmortem that does not invent a recovery date.
Analytics4 min
Email Deliverability ROI: Revenue at Risk
A delivered campaign can still miss the inbox. This is how to estimate the revenue in that gap from your own numbers, using InboxEagle's Q1 2026 placement study only as context, not as your store's loss.
Analytics7 min
Delivered but Not Received: Why Emails Disappear
Your ESP marked the message delivered and the customer never saw it. That usually means the mailbox accepted the mail and then filed it somewhere other than the inbox, or your own platform suppressed it before the handoff. Here is how to tell those cases apart.
Analytics6 min
Gmail Deliverability Troubleshooting Guide
Gmail can accept a campaign and still file it in spam. This is the order to check Compliance status, the Postmaster spam rate, and authentication before you rewrite the creative or change ESPs.
Analytics3 min
How to Monitor Deliverability at Gmail, Yahoo, and Outlook
Gmail, Yahoo, and Outlook do not share one dashboard. Here is which official tool covers which signal, and what a seed test adds for Gmail, Yahoo, AOL, and Outlook.
Analytics3 min
Why Purchased Email Lists Damage Deliverability
Bought addresses did not ask for your mail. They bounce, they complain, and they are how pristine spam traps get onto a domain that used to be fine.
Analytics8 min
Why Are My Emails Suddenly Going to Spam?
A sudden move to the spam folder is a diagnosis problem, not a subject-line problem. Here is how an eCommerce sender works out whether authentication, complaints, list quality, or a provider filter caused it, and how to confirm the fix.
Analytics6 min
Yahoo Email Deliverability: Sender Hub and Complaint Rate
Yahoo's bulk-sender rules are authentication, a complaint rate under 0.30% on mail that reached the inbox, and one-click unsubscribe. Sender Hub is where you see your own domain. This is how to use it when Yahoo placement drops.
Analytics11 min
Test Your Email's Spam Score Before a Klaviyo Send
How to test your email's spam score before a Klaviyo send, using data from 528,475 real campaigns on what actually correlates with inbox placement.
Analytics46 min
10 Best Email Deliverability Tools 2026, Tested for Ecommerce
A hands-on look at the email deliverability tool market: we tested email deliverability tools across placement testing, monitoring, warmup, and authentication, then ranked them for senders on any ESP. Here's what actually works, including where our own tool falls short.
Analytics9 min
What Does Email Deliverability Intelligence From 1.3M Inbox Sends Mean For Your Business
What is email deliverability intelligence? I analyzed 1.3M+ sends to show why SPF/DKIM/DMARC passes don't guarantee ecommerce inbox placement.
Analytics6 min
What Are Spam Traps and How Do They End Up on Your List?
Spam traps are email addresses that exist to catch senders with poor list practices. Hitting one doesn't mean you're a spammer. It means your list has a hygiene problem. Here's what the different types are, how eCommerce brands acquire them, and what to do about it.
Analytics7 min
774K Emails Tested: Does a First Name in Your Subject Line Keep You Out of Spam?
InboxEagle analyzed 774,775 emails to measure what subject line personalization does to inbox placement. Personalized subjects hit 18.4% spam vs. 22.46% for non-personalized sends — a 4-point gap.
Analytics9 min
What Should an Email Deliverability Dashboard Show? (2026)
Most email dashboards show opens, clicks, and bounces. A deliverability dashboard shows something different: where your email actually landed, why, and whether your sending program is getting healthier or worse.
Analytics10 min
Seed List Testing vs. Real-World Inbox Monitoring: What's the Difference? (2026)
Seed list testing and real-world inbox monitoring both measure inbox placement, but they answer different questions. Here's how each works, when to use which, and why InboxEagle gives you both.
Analytics11 min
How to Check If Your Emails Are Landing in Spam
Your ESP says delivered. Delivered doesn't mean inbox. Four ways to find out where your campaigns actually landed — from a free 20-minute manual check to continuous placement monitoring.
Analytics15 min
Klaviyo Deliverability Hub: What It Misses
Klaviyo's Deliverability Hub is not an inbox placement tool. Here's what each panel actually measures and the blind spots you need to cover.
Analytics7 min
Does Email Link Density Hurt Deliverability? 192K Emails Say the Opposite
Does email link density hurt inbox placement? InboxEagle analyzed 192,651 emails by actual link count. The result flips the conventional rule on its head.
Analytics4 min
What Is Email Deliverability? A Plain-English Guide
Email deliverability is whether your emails reach the inbox, not just whether they were sent. Here's what it means, why it matters for eCommerce revenue, and what actually affects it.
Analytics7 min
Does Your Email Image-to-Text Ratio Actually Cause Spam?
Does email image-to-text ratio really cause spam? InboxEagle analyzed 774,828 emails. Image-heavy emails outperform balanced content on inbox placement.
Analytics10 min
Spam Complaint Rate: What Every eCommerce Store Owner Needs to Know (2026)
Spam complaint rate is the metric Gmail uses to decide if your emails reach the inbox — and your Klaviyo dashboard isn't showing you the real number. Here's how to check it, what drives it up, and how to recover.
Analytics15 min
Email Blacklist Removal: Check, Causes and Delisting (2026)
An email blacklist can silently block your campaigns before a single recipient sees them. Here's what blacklists are, the exact behaviors that trigger a listing, how to run a free email blacklist check, and how to get removed.
Analytics11 min
Klaviyo + InboxEagle: How to Monitor Every Flow and Campaign
The Klaviyo InboxEagle integration gives you actual inbox placement data alongside Klaviyo's engagement metrics. This guide covers Private API Key setup, webhook configuration, analytics dashboards, and the monitoring workflow.
Analytics8 min
Do Spam Trigger Words Really Cause Spam? 774K Emails Tested
Do spam trigger words like 'free' and 'sale' actually send emails to spam? We analyzed 774,828 emails from Q1 2026. The findings may surprise you.
Analytics10 min
How to Check Your Email Sender Reputation Score
Your sender reputation score determines inbox or spam — before you hit send. Here's how to check it for free across Gmail, Outlook, and enterprise infrastructure, and what to do when the numbers are bad.
Analytics8 min
Email Sunset Policy: The Data Behind a 3× Spam Rate Gap
InboxEagle analyzed 16,356 ecommerce senders. Low-volume programs average a 56% spam rate. High-volume programs average 18%. The difference is a sunset policy.
Analytics13 min
Monitor Email Delivery in Real Time: Deliverability Guide
How to monitor email delivery in real time: the email deliverability metrics to monitor, the email deliverability monitoring tools that surface them, and how to act before a problem becomes a crisis.
Analytics9 min
List-Unsubscribe Header: Does It Actually Reduce Spam Rates?
Does the List-Unsubscribe header actually lower spam rates? InboxEagle's study of 19,797 brands reveals a 4.86x extreme spam risk for senders without it.
Analytics8 min
The Correlation Between High Sending Frequency & Spam Complaints
Does sending more emails mean more spam complaints? InboxEagle analyzed 31,586 sending programs — the data tells a more nuanced story than you think.
Analytics8 min
Gmail Spam Rate Thresholds: What 0.10% and 0.30% Actually Mean for You
Google sets two spam rate numbers that most senders misread. Here's exactly what 0.10% and 0.30% mean, how they're measured, and what to do before you breach either one.
Analytics8 min
Gmail Promotions vs Spam: Where 671K Ecommerce Emails Landed
We measured Gmail placement for 671,329 emails across ~19,400 ecommerce senders in Q1 2026. Brand-level deliverability turns out to be close to binary — and the middle ground barely exists.
Analytics8 min
Dedicated IP vs. Shared IP for Email: What the Data Actually Shows
InboxEagle analyzed 15,174 IPs — 7,166 dedicated and 8,008 shared. Dedicated IPs had lower spam rates but lower Primary inbox. Here's why, and when a dedicated IP for email actually makes sense.
Analytics6 min
Do Aggressive Sale Subject Lines Hurt Deliverability? What Our Data Shows
Sale language doesn't automatically hurt deliverability — but some patterns do. InboxEagle analyzed 721,351 emails and found results that flip conventional wisdom on its head.
Analytics13 min
Where Your Email Lands: Inbox, Promotions, or Spam?
Most senders track delivered vs. spam. But Gmail has a third folder — the Promotions tab — that quietly buries marketing emails just as effectively. Here's what determines where your email lands, and how to see all three outcomes before you send.
Analytics5 min
How AI Monitors Email Deliverability: What's Actually Different
AI-powered deliverability monitoring alerts you within a minute of Google publishing data, identifies root causes, and generates action plans — here's exactly how it works differently from traditional dashboards.
Analytics5 min
What Is a Good Inbox Placement Rate? 2026 Benchmarks
Industry benchmarks for inbox placement rates across eCommerce, SaaS, and B2B — and what to do if yours falls short.
Analytics8 min
Inbox Placement vs. Delivery Rate: Know the Difference
Your ESP says 99% delivered. But how much of that mail actually reached the inbox? The difference between delivery rate and inbox placement rate — and why it matters enormously for revenue.
Analytics8 min
Why Your Email Open Rate Is Lying to You (And What to Track Instead)
Apple Mail Privacy Protection and security scanner pre-fetching have made open rate an unreliable metric. Here's what's happening, why high open rates can be a warning sign, and what to measure instead.
Analytics8 min
Klaviyo Emails Going to Spam: Troubleshooting Guide
Klaviyo can show a message as delivered while Gmail or Yahoo files it in spam. Here is how to separate Klaviyo's own complaint bands from Gmail's spam rate, then verify the fix on the next send.
Related Tools & Features
Inbox Placement Testing
Test exactly where your emails land across Gmail, Outlook, Yahoo, and 20+ more providers in under 5 minutes.
Gmail Reputation Monitoring
Monitor your Gmail domain reputation score, spam complaint rate, and authentication pass rates automatically.
Free Deliverability Checker
Scan your sending domain for SPF, DKIM, DMARC, and blacklist issues instantly. No signup required.