Blog
Email Deliverability Guides & Best Practices
Guides, best practices, and intelligence from the InboxEagle team to help you land in the inbox every time.
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.
Klaviyo8 min
How Klaviyo's IP Warm-Up Process Works: Shared IPs, Dedicated IPs, and Domain Warming Explained
Most Klaviyo senders never touch a dedicated IP. But whether you're on shared or dedicated infrastructure, the warm-up process affects your inbox placement from day one. Here's exactly how it works.
E-commerce9 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.
Authentication10 min
What Is DMARC? Plain-English Guide for eCommerce Senders
DMARC is a setting on your domain that tells Gmail and Outlook what to do when someone sends email pretending to be you. Here's what it means, why it's now required, and how to know if yours is working.
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.
Authentication9 min
How to Set Up a Subdomain Strategy for Email Sending
Three decisions before you touch DNS: which subdomain, whether to split marketing from transactional, and how DMARC cascades. Complete setup guide.
Klaviyo11 min
Apple Mail Privacy Protection: The Real Deliverability Cost
Apple MPP doesn't just inflate open rates — it corrupts Klaviyo engagement segments, breaks win-back flows, and quietly damages domain reputation.
E-commerce14 min
Black Friday Email Deliverability: The Complete BFCM Preparation Guide (2026)
BFCM is the highest-risk sending period of the year. Here's the 8-week preparation timeline, Klaviyo-specific settings, a send-day monitoring workflow, and post-BFCM recovery plan to protect inbox placement when it matters most.
Klaviyo15 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.
E-commerce9 min
IP Reputation vs. Domain Reputation: Which Matters More in 2026?
IP reputation vs. domain reputation, Gmail, Outlook, and Yahoo weight them differently. Here's exactly what each provider prioritizes and where to focus your effort in 2026.