Blog
Email Deliverability Guides & Best Practices
Guides, best practices, and intelligence from the InboxEagle team to help you land in the inbox every time.
E-commerce4 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.
Automation9 min
How to Improve Inbox Placement in Klaviyo Flows vs. Campaigns
Flows and campaigns behave differently in Klaviyo, and mailbox providers treat them differently too. Here's how to optimize inbox placement for each.
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.
Klaviyo11 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.
E-commerce8 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.
Klaviyo10 min
Klaviyo Suppression Lists: How to Use Them to Protect Deliverability
Klaviyo suppression list: five suppression types, global vs. list-level scope, what can be reversed, what suppression does to your bill, and how to use it to actively protect inbox placement.
Authentication6 min
Email Authentication for Klaviyo Senders: The Complete Guide
Email authentication is the foundation of inbox placement for every Klaviyo sender. Here's what SPF, DKIM, and DMARC actually do, why Klaviyo's default setup breaks DMARC alignment, and where to go deeper on each.
E-commerce11 min
Email Deliverability for eCommerce Agencies
How an agency keeps one client's campaigns from damaging another's: domain isolation, per-brand monitoring, a client report that is not a portfolio average, and the point at which you escalate.