Klaviyo Deliverability Guides
Practical guides to fix inbox placement, improve list health, and get the most out of your Klaviyo sending program.
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.
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.
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.
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, the billing distinction most brands miss, and how to use it to actively protect inbox placement.
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.
Email Deliverability for Agencies: How to Manage Multiple Client Domains
Managing email deliverability across multiple client domains is one of the hardest operational challenges in eCommerce agency work. Here's the framework — domain isolation, monitoring at scale, and the mistakes that cause one client to hurt another.
Email List Hygiene: The Deliverability Practice Most eCommerce Brands Skip
Email list hygiene is one of the highest-leverage deliverability practices for eCommerce brands — yet most skip it until a crisis forces their hand. Here's exactly what it is, why it matters, and how to diagnose and fix list decay in Klaviyo.
Why Your "Mailed-By" Domain Matters for Brand Trust
82.8% of marketing emails display a third-party mailed-by domain in Gmail. Here's what that signals to your subscribers and why it's quietly costing you deliverability equity.
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.
Setting Up a Custom Sending Domain in Klaviyo: Step by Step
A complete guide to setting up a Klaviyo custom sending domain — with DNS records, authentication verification, and why it matters for deliverability.
The Technical Anatomy of a Perfect Ecommerce Email Header
InboxEagle analyzed 256,606 emails across 16,381 brands. Only 16.7% had a perfect header. Here's what separates them from the rest — and how to fix yours.
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.
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.
Fixing Inbox Placement Issues in Klaviyo: A Practical Guide
Step-by-step troubleshooting for Klaviyo users struggling with spam placement, low open rates, and sender reputation issues.