E-commerce Email Deliverability
Protect your inbox placement during peak sending periods — BFCM, holiday campaigns, and rapid list growth — without losing revenue.
E-commerce7 min
Shopify DMARC Fix: Make Order Emails Pass Alignment
You found out why order confirmations fail authentication: Shopify is still sending from its default sender. Here is the fix, in order. Authenticate the domain, publish the DMARC record, prove it in a real order email, and only then tighten the policy.
E-commerce16 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.
E-commerce4 min
BFCM Email Volume Ramp: A Work-Back Schedule
Your Black Friday send is several times larger than a normal week. Count the steps between the two, then work back from 27 November so the last increase lands with days to spare.
E-commerce3 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.
E-commerce4 min
How to Lower Your Klaviyo Bill by Suppressing Profiles
Klaviyo bills on active profiles, and a suppressed profile is not active. Suppressing the subscribers who stopped engaging cuts the count your plan is priced on and removes the mail that hurts your reputation.
E-commerce4 min
Shopify Email Deliverability: Setup and Limits
Shopify sends your order confirmations and your campaigns from one sender address. Until you authenticate the domain, that address is not even yours. Here is what to set up and what Shopify will not show you.
E-commerce3 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.
E-commerce5 min
Changing Your Sending Domain Without Losing Reputation
A new From domain does not inherit the old one's reputation. It starts with whatever history that hostname already has, which is often none. Here is how you cut over without a week of authentication failures.
E-commerce5 min
eCommerce Email Sending Architecture
Campaigns, flows, and receipts should not be one undifferentiated stream. This is how to separate domains and reputation on purpose, and which existing guides cover the DNS once the shape is chosen.
E-commerce3 min
Why Is My Email Bounce Rate Suddenly Increasing?
A sudden bounce spike is usually a new list, a provider block, or a deferral wave. Here is how to tell those apart before you suppress customers or raise volume.
E-commerce4 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.
E-commerce3 min
Email Deferrals: Why Mailbox Providers Delay Mail
A deferral is a 4xx response: the mailbox provider is telling your ESP to try again later. Here is how that differs from a bounce, a block, and the spam folder.
E-commerce3 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.
E-commerce4 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.
E-commerce7 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.
E-commerce6 min
How to Migrate ESPs Without Losing Deliverability
Switching email platforms does not reset domain reputation, and it can break SPF and DKIM on the day you cut over. Here is the sequence that keeps your campaigns and receipts accepted while the new platform warms up.
E-commerce6 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.
E-commerce3 min
Hard Bounce vs Soft Bounce for Deliverability
A hard bounce is a permanent failure. A soft bounce is temporary. Here is how eCommerce senders tell them apart, what Klaviyo suppresses, and which bounce should stop the next send.
E-commerce3 min
How to Recover After an IP Warmup Failure
If inbox placement or bounces break while you are still raising volume, stop the ramp. Sending more mail does not build reputation faster.
E-commerce3 min
Klaviyo vs Amazon SES for Deliverability
Klaviyo and Amazon SES put reputation in different places. One is a marketing platform with shared infrastructure. The other is infrastructure you operate. Neither one shows the Gmail folder by itself.
E-commerce3 min
How to Move DMARC from Monitoring to Enforcement
Start at p=none, make every real source align, then tighten policy. p=reject is not a Gmail requirement, and RFC 9989 warns it can break mail you still need.
E-commerce3 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.
E-commerce3 min
Multiple DKIM Selectors: When to Use Each
Each sending service should sign with its own DKIM selector. Sharing one selector name means one DNS key, and rotation then breaks the other sender.
E-commerce4 min
Why Order Confirmation Emails Go to Spam
Order mail goes to spam when it shares a reputation with marketing, or when the transactional sender is not authenticated. Here is how to tell those apart and keep receipts delivering.
E-commerce3 min
Why Inbox Placement Differs by Mailbox Provider
The same campaign can hit the Gmail inbox, Yahoo spam, and an Outlook rejection. Here is how to tell a provider-specific problem from a broken program.
E-commerce3 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.
E-commerce4 min
How Long Sender Reputation Takes to Recover
Mailbox providers do not publish a recovery clock for IP or domain reputation. Here is what is actually documented, and what to do while you wait.
E-commerce4 min
SMTP 4xx vs 5xx: How to Read a Delivery Error
A 4xx code means try again. A 5xx code means the receiver rejected the message. Here is how to read SMTP errors when authentication already passes.
E-commerce3 min
SPF 10-Lookup Limit and SPF Flattening
SPF fails with a permerror after too many DNS lookups. Flattening can pass the check today and break when your ESP changes IP ranges.
E-commerce3 min
Tracking Domains, Redirects, and URL Shorteners
Click-tracking hosts and public shorteners are a different problem from the From domain. Here is when a branded tracking domain helps, and when a redirect chain is the risk.
E-commerce3 min
Unknown Senders in Your DMARC Reports
An aggregate report source you do not recognize is either a vendor you forgot or someone using your domain. Here is how to tell, without jumping to p=reject the same day.
E-commerce8 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.
E-commerce6 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.
E-commerce9 min
Gmail Emails Going to Spam? What 514K Messages Show
Your ESP dashboard says delivered. Then you check Gmail and find it in Spam. We tracked 514,492 Gmail-bound ecommerce messages between 11 June and 11 September 2026: 25% landed in spam, and unauthenticated mail was more than twice as likely to get filtered. Here's what actually moves the needle — authentication, ESP choice, and sending volume — and what a blended, all-provider dashboard hides about your Gmail-specific problem.
E-commerce11 min
No DMARC Record Found? Klaviyo DMARC Setup Guide (2026)
If a checker just told you 'no DMARC record found', anyone can send email as your store and you'd never know. Unauthenticated mail hit spam 45% of the time in our data, more than double the rate for authenticated mail. 23% of the 14,101 ecommerce domains we checked this summer had the same gap. Here's why it happens to Klaviyo and Shopify stores, and the complete setup that fixes it.
E-commerce46 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.
E-commerce9 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.
E-commerce9 min
The Pre-Q4 Email Deliverability Audit: What to Fix Before October
A five-area audit framework for email agencies preparing Klaviyo eCommerce clients for BFCM. Authentication, reputation, list hygiene, inbox placement, and infrastructure — what to check, what bad looks like, and what to fix before it is too late.
E-commerce29 min
Email Deliverability for E-Commerce: Klaviyo Brands Guide (2026)
Email deliverability for e-commerce, explained for Klaviyo brands: everything about inbox placement, sender reputation, authentication, list hygiene, and seasonal deliverability. InboxEagle data: 1 in 6 marketing emails never reaches the primary inbox.
E-commerce7 min
Amazon Prime Day Effect: How Competing Sales in July Damage Sender Reputation
Amazon Prime Day triggers an industry-wide email volume spike every July. Brands that run counter-programming sales without preparing their sending program pay for it in August, and sometimes all the way through Q4. Here is what happens and how to avoid it.
E-commerce10 min
Back-to-School Email Deliverability: The August Preparation Checklist
Back-to-school is the third-largest US eCommerce sending period of the year. Most brands start preparing the creative in June and ignore deliverability until August, which is exactly the wrong order. Here is what to audit, fix, and confirm before the sends start.
E-commerce7 min
5 Signs Your Email Program Has a Deliverability Problem (Not a Creative Problem)
Falling open rates and flat campaign revenue are easy to blame on subject lines and creative. But if the underlying problem is deliverability, no amount of copy testing will fix it. Here are the five signs that tell you where the problem actually is.
E-commerce9 min
Agency Email Deliverability Checklist: What to Review Every Month
A structured monthly review process for agencies managing email deliverability across multiple eCommerce clients. Covers authentication, inbox placement, list health, complaint rate, and the signals most agency teams miss until it is too late.
E-commerce6 min
Email Validation vs. Email Verification: What's the Difference?
Email validation and email verification are not the same thing, and using the wrong one at the wrong moment costs you deliverability. Here's what each actually does, when to use each, and why eCommerce senders need both.
E-commerce7 min
What Top eCommerce Brands Do Differently with Email Deliverability
The brands with consistently high inbox placement rates are not using different tools. They are making different decisions about infrastructure, list quality, and how they measure success. Here is what separates them.
E-commerce7 min
How to Monitor Competitor Email Strategies
You can see exactly what your competitors are sending, when they send it, and how their infrastructure is set up, without any special access. Here is how eCommerce brands use publicly available signals to benchmark against their category.
E-commerce6 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.
E-commerce10 min
Email Deliverability Recovery: The First 24 Hours
The first day of a deliverability crisis is for stopping the sends that are making it worse and naming the cause. Reputation repair takes longer than 24 hours. Here is the timed checklist, then the multi-week recovery that follows.
E-commerce8 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.
E-commerce10 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.
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.
E-commerce7 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.
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.
E-commerce9 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.
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.
E-commerce10 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.
E-commerce6 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.
E-commerce9 min
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.
E-commerce6 min
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.
E-commerce13 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.
E-commerce9 min
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.
E-commerce7 min
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.
E-commerce6 min
What Is a Sending Domain and Why Does It Need Its Own Reputation?
Your sending domain is the identity your email program lives or dies by — and it's separate from your website. Here's what it is, why it needs its own reputation, and what most Klaviyo senders get wrong about it.
E-commerce7 min
Email Domain Reputation Score: How It's Scored and Protected
Email domain reputation is the primary signal ISPs use to route your campaigns. Here's exactly how it's scored, what damages it fastest, and how to protect it before the next send.
E-commerce8 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.
E-commerce8 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.
E-commerce9 min
How Domain Alignment Affects Inbox Placement in 2026
Domain alignment is why your emails fail DMARC even with valid SPF and DKIM — here's what's breaking and how to fix it.
E-commerce6 min
Does DMARC Failure Guarantee the Spam Folder? A 2M Email Study
We analyzed 2.2 million emails to find out if DMARC failure sends you straight to spam. The answer is more nuanced, and more actionable, than you'd expect.
E-commerce6 min
The State of Email Authentication: SPF/DKIM Adoption in Ecommerce
Email authentication adoption in ecommerce leads every other industry — yet most brands still run DMARC at p=none. Here's what the 2025/2026 data says and where the real gap is.
E-commerce8 min
Gmail Deliverability Benchmarks for Ecommerce Brands: Q1 2026 Data
InboxEagle monitored 721,351 emails to Gmail in Q1 2026. Here are the real gmail deliverability benchmarks — spam rates, tab placement, and what separates healthy programs from at-risk ones.
E-commerce6 min
The Ecommerce Email Deliverability Gap: What Top Brands Do Differently
InboxEagle analyzed 3,474 ecommerce sender domains and found a 72-point inbox placement gap between the best and worst performers. Here's the ecommerce email performance benchmark — and what separates top-quartile brands from everyone else.
E-commerce6 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.
E-commerce7 min
Outlook 550 5.7.515: What It Means and How to Fix It
Microsoft returns 550 5.7.515 when the domain in the From address fails Outlook.com's high-volume authentication rules. The message is rejected. Here is the definition Microsoft publishes, and the checks that match it.
E-commerce10 min
Ecommerce Email Benchmarks 2026: Inbox, Promotions & Spam
InboxEagle analyzed 721,351 ecommerce emails in Q1 2026. Here's where they landed — Primary, Promotions, and Spam — and what the data means for your sending program.
E-commerce5 min
Managing Email Sender Reputation During E-commerce Volume Spikes
How to protect your inbox placement during Black Friday, product launches, and other high-volume sending events.
E-commerce8 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.