How to Stop Your Shopify Emails Landing in Spam

If your Shopify campaigns are reaching spam folders, you are not just losing the sales from that send. You are damaging the sender reputation that decides whether every future email reaches the inbox at all. Gmail, Outlook and Yahoo decide where your email lands from a stack of technical checks, recipient behaviour and reputation data, and failing one layer can see a whole sending domain quietly filtered.

This guide covers each layer, what it means for a Shopify store, and the steps that keep you on the right side of it. If you are also growing your list or improving your wider email programme, see how to get more Shopify email subscribers and how to optimise your Shopify email marketing.

Key Takeaways

• Landing in spam costs more than one campaign: it erodes the sender reputation that decides whether every later email reaches the inbox.
• SPF, DKIM and DMARC come first. Google and Yahoo have required them of bulk senders since 2024, and since November 2025 Gmail can reject mail that fails its requirements rather than only filtering it.
• Most stores fail at this step. Of the last 80 Shopify stores we audited, 62 had no DMARC record and 45 had DKIM set up incorrectly.
• If you send through Klaviyo you usually do not add an SPF record at all: a branded sending domain handles SPF and DKIM, and you publish DMARC with your DNS provider.
• Sending to people who never engage is the most common self inflicted problem. Suppress contacts who have not clicked or bought in about 90 days.
• Keep spam complaints below Google's 0.1% guideline, never 0.3%, and keep one click unsubscribe in every marketing email.
• The work pays back: deliverability work we carried out produced a 95% fall in hard and soft bounces.

Quick Answer

To stop your Shopify emails landing in spam, authenticate your domain first. Set up SPF, DKIM and DMARC, which with Klaviyo means adding the records it generates for a branded sending domain and publishing a DMARC record with your DNS provider. Then suppress subscribers who have not clicked or bought in about 90 days, keep spam complaints below Google's 0.1% guideline, use double opt in for sign ups from cold traffic, and keep one click unsubscribe in every email. Test campaigns with Mail Tester before sending and check blocklists monthly with MXToolbox. If you are already in spam, authentication and list hygiene are almost always the cause.

Table of Contents

• Why Spam Filtering Matters for Shopify Stores
• The Authentication Stack: SPF, DKIM and DMARC
• Spam Content Filtering
• Sender Reputation
• Engagement Based Filtering
• List Hygiene and Bounce Management
• Spam Trap Detection
• Unsubscribe Compliance
• Machine Learning Filtering
• Blocklist Monitoring
• The Tools Worth Bookmarking
• Email Deliverability Checklist
• Why Matters Perspective
• Frequently Asked Questions
• Final Thoughts
• Related Articles

Why Spam Filtering Matters for Shopify Stores

Mailbox providers do not only filter obvious junk. They assess every sender's technical setup, sending history and how recipients respond. A store sending perfectly legitimate promotions can still land in spam if its domain is not authenticated, its list is full of inactive addresses, or its complaint rate creeps above 0.1%.

The rules have tightened. Since 2024, Google and Yahoo have required bulk senders to authenticate their mail and support one click unsubscribe. Google defines a bulk sender as one sending around 5,000 or more messages a day to personal Gmail accounts, and its sender guidelines FAQ says that from November 2025 Gmail began ramping up enforcement, so messages that fail its requirements can now be temporarily or permanently rejected rather than simply filtered to spam.

The good news is that every layer below can be fixed, and most of the fixes are one time technical tasks rather than ongoing work.

The Authentication Stack: SPF, DKIM and DMARC

These three records work as a system rather than as alternatives, and missing any one weakens the other two, so set all three up before anything else on this page. This is also where most stores fail. Of the last 80 Shopify stores we audited, 62 had no DMARC record at all and 45 had DKIM set up incorrectly: more than three quarters missing DMARC, and more than half with broken DKIM.

SPF: Sender Policy Framework

SPF lets a receiving server check that the server sending your email is allowed to send for your domain. If you send through Klaviyo, you usually do not need to add an SPF record at all: Klaviyo's help centre explains that it uses its own return path domain, so SPF passes by default, and a branded sending domain's records handle SPF for that subdomain. Where you send from other services too, such as Google Workspace for your own mailbox, keep a single SPF record on your root domain that lists each of them, because a domain can only have one SPF record.

DKIM: DomainKeys Identified Mail

DKIM signs every email with a private key held by your sending platform, and the receiving server checks the signature against a public key published in your DNS, which proves the email came from your domain and was not altered. In Klaviyo, you get this by setting up a branded sending domain under Settings, then Domains, and adding the CNAME or NS records it generates for a subdomain such as send.yourstore.co.uk. Until you do, Klaviyo sends from its shared domain, which authenticates your mail but builds no trust in your own domain.

DMARC: Domain based Message Authentication, Reporting and Conformance

DMARC tells receiving servers what to do with mail that fails authentication: nothing, send it to spam, or reject it. It also sends you reports showing who is sending email in your name, which exposes anyone spoofing your domain. Klaviyo notes that DMARC is set up outside Klaviyo, with your DNS provider. A safe starting record is v=DMARC1; p=none; rua=mailto:you@yourdomain.com, which monitors without blocking anything and sends you daily summaries. Once every legitimate sender passes, move to p=quarantine and then p=reject. Google and Yahoo have required at least a p=none record for bulk senders since 2024.

Spam Content Filtering

Providers scan the subject line, body and headers of every email for known spam patterns: misleading subject lines, capitals and heavy punctuation, hidden text, suspicious HTML, and emails built almost entirely from images with little readable text.

Write subject lines that describe what is actually in the email, keep plenty of live text alongside your images, because an email built from one large image gives filters little to read and shows nothing when images are blocked, and test before you send. Mail Tester scores a single email for spam indicators, authentication and content when you send it to the address it gives you. GlockApps goes further, testing placement across Gmail, Outlook, Yahoo and others at once before an email reaches your full list.

Sender Reputation

Every sending domain and IP address builds a reputation from its history. High bounce rates, high complaint rates, spam trap hits and sudden jumps in volume all pull it down, and providers combine their own data with third party reputation lists when they decide where your email lands.

Keep your list clean, never buy lists, and warm up a new sending domain gradually by sending to your most engaged subscribers first. Google's sender guidelines ask senders to keep their spam rate below 0.1% and never let it reach 0.3%. If you use an established platform such as Klaviyo, the sending IPs are managed and warmed for you, which is one of the clearest advantages of not running your own mail servers.

Engagement Based Filtering

Gmail in particular weighs how recipients behave. Subscribers who open, click and never mark you as spam teach it to deliver your email to the inbox; subscribers who ignore you for months teach it the opposite, however well your domain is authenticated.

Build a segment of contacts who have not clicked or bought in the last 90 to 120 days, and either run a short win back sequence or remove them from regular sends. Base the segment on clicks and orders rather than opens, because Apple Mail can load emails in the background and inflate open rates. A smaller engaged list beats a large disengaged one on revenue and on deliverability; our Shopify email marketing guide covers the segmentation in detail.

List Hygiene and Bounce Management

Hard bounces, meaning addresses that do not exist, are a strong negative signal, because an old, bought or neglected list is the hallmark of a spammer. Use double opt in so only confirmed addresses join your list, make sure hard bounces are suppressed automatically, and validate the list periodically with a tool such as ZeroBounce or NeverBounce.

The effect of doing this properly is measurable: deliverability work we carried out produced a 95% fall in hard and soft bounces. For building a clean list from the start, see how to get more Shopify email subscribers.

Spam Trap Detection

Providers and anti spam organisations run spam trap addresses that never signed up for anything and exist only to catch senders who scrape or buy lists. Old addresses are also recycled into traps after years of inactivity. Hitting even a few can damage your reputation and get you blocklisted. Only email people who actively opted in, never buy, rent or scrape lists, and remove long inactive contacts rather than mailing them indefinitely.

Unsubscribe Compliance

Google and Yahoo require bulk senders to support one click unsubscribe through the List Unsubscribe header, which powers the unsubscribe link Gmail shows at the top of an email, and Google expects unsubscribes to be honoured within two days. Most modern email platforms add the header and manage opt outs for you. Never hide the unsubscribe link in your template: making it hard to leave does not keep subscribers, it turns them into spam complaints, which do far more damage than a lost subscriber.

Machine Learning Filtering

Gmail and other providers use models trained on vast amounts of email to spot spam patterns no fixed rule could catch, learning from how millions of people react. There is no technical workaround for this layer, because it rewards email people want. An order confirmation almost never lands in spam; a generic promotion sent to an unsegmented list is the highest risk email you can send.

Blocklist Monitoring

Third party blocklists such as Spamhaus and Barracuda are consulted by providers deciding whether to accept mail, and a domain or IP can be added after a complaint spike or spam trap hits. Once listed, most of your email can be blocked or filtered by every provider that uses that list. Check your domain and sending IP monthly with MXToolbox, which tests more than 100 lists at once for free. If you are listed, fix the cause before you apply for delisting.

The Tools Worth Bookmarking

Google Postmaster Tools changed in late 2025. Google retired the old domain and IP reputation charts when it moved to the new version, so the numbers to watch now are your compliance status against Gmail's requirements, your spam rate and your delivery errors.

Email Deliverability Checklist

Why Matters Perspective

Most deliverability problems we are asked to look at come down to two things: missing authentication, or a list that has not been cleaned in years. Our audits bear out the first, with 62 of the last 80 stores we reviewed missing a DMARC record and 45 with DKIM set up incorrectly.

The second is the harder conversation, because merchants are understandably reluctant to suppress subscribers they paid to acquire. But a list of 40,000 where 30,000 never engage is not an asset. It drags down delivery to the 10,000 who do want to hear from you, and cleaning it is what lets your emails reach the inbox again. Done properly, the results are measurable: deliverability work we carried out produced a 95% fall in hard and soft bounces.

Deliverability also underpins everything else in email. A perfectly built abandoned cart flow recovers nothing if it lands in spam, so this is the layer to fix first. As a Klaviyo partner we set this up regularly, and our email marketing agency can review your Klaviyo setup and fix the authentication for you.

Frequently Asked Questions

Why are my Shopify emails going to spam even though I have not done anything wrong?

Usually because of missing or misconfigured SPF, DKIM or DMARC records, a list with too many unengaged or invalid addresses, or a spam complaint rate above Google's 0.1% guideline. Of the last 80 stores we audited, 62 had no DMARC record. Check your domain with MXToolbox and your last campaign with Mail Tester to find the specific cause.

Is it enough to just set up SPF and DKIM?

No. Google and Yahoo also require bulk senders to publish a DMARC record, at minimum with a policy of p=none. The three work together as a system, and DMARC is also what tells you who is sending email in your name.

Do I need to add SPF and DKIM records if I use Klaviyo?

Not separately. Klaviyo says you usually do not need to add an SPF record, because it uses its own return path domain, and a branded sending domain set up under Settings, then Domains, handles SPF and DKIM through the records Klaviyo generates. You still need to publish a DMARC record for your root domain with your DNS provider.

How do I know if my Shopify store is on an email blocklist?

Use the free blacklist check at MXToolbox, which tests your domain and sending IP against more than 100 lists at once. If you are listed, fix the underlying cause, usually high complaints or spam traps, then follow that list's delisting process.

What spam complaint rate is safe for a Shopify sender?

Google asks senders to keep their user reported spam rate below 0.1% and never let it reach 0.3%. Above 0.1% inbox delivery already suffers, and at 0.3% or more you lose eligibility for Gmail's delivery mitigation until the rate comes down. Google measures it daily, so one badly targeted campaign shows up quickly.

Should I delete unengaged subscribers or just stop emailing them?

Suppress them rather than deleting them. Suppression stops your regular campaigns reaching them while keeping the records for reporting and a possible win back later. What damages your reputation is continuing to send to people who never engage.

Does Google Postmaster Tools still show my domain reputation?

No. Google retired the domain and IP reputation charts when it moved Postmaster Tools to its new version in late 2025. It now shows a compliance status against Gmail's sender requirements, your spam rate, authentication results and delivery errors, which is where reputation problems now show up.

Final Thoughts

Deliverability is not glamorous, but it is the layer everything else in your email programme sits on. A brilliant campaign that lands in spam earns less than an ordinary one that reaches the inbox.

Most of the work is front loaded. Set up SPF, DKIM and DMARC once, make suppressing unengaged contacts a habit, watch your complaint rate and test before major sends. After that it becomes a monthly check rather than an ongoing worry, and if your emails are already landing in spam, start with authentication and list hygiene.

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• How to Get More Email Subscribers on Your Shopify Store
• Klaviyo Flows Every Shopify Subscription Brand Should Build
• How to Get Shopify Repeat Customers: A Practical Implementation Guide
• How to Increase Shopify Conversions: 10 Proven Strategies
• How to Optimise Your Shopify Store for SEO