Your customers aren't ignoring your emails. They're not seeing them. Shopify email deliverability breaks when your DNS authentication records are missing or misconfigured — and Gmail, Yahoo, and Microsoft send those messages straight to spam. The average ecommerce email open rate sits around 31%, but for stores without proper SPF, DKIM, and DMARC records, that number drops to single digits.

Since February 2024, Google and Yahoo have enforced strict email authentication requirements for all senders. Microsoft followed in May 2025. Gmail tightened enforcement again in November 2025, moving from delays to outright rejections. If your Shopify store's DNS records aren't configured correctly, your order confirmations, shipping updates, and marketing campaigns are getting filtered before your customers ever scroll past their inbox.

Why Shopify Emails Hit Spam (It's Probably Not Your Content)

Most merchants blame their subject lines or email frequency when open rates drop. The actual problem is almost always authentication. Email providers check three things before delivering your message: SPF (who's allowed to send from your domain), DKIM (whether the message was tampered with), and DMARC (what to do if SPF or DKIM fails). Miss any one of these, and your email gets flagged.

Shopify adds a second layer of risk. Your store shares email infrastructure with millions of other stores. When other merchants on that shared infrastructure send spam or get reported, it drags down the reputation of the sending IP — and your legitimate order confirmation gets filtered because someone else's store sent junk mail yesterday.

This is why authentication matters even more for Shopify merchants than for businesses running their own email servers. Proper SPF, DKIM, and DMARC records tell Gmail and Yahoo: "This email actually came from this store's domain, and they authorized it." Without those records, you're just another unauthenticated sender on a shared IP.

How Do You Check Your Shopify Email Deliverability?

Before fixing anything, find out where you stand. Send a test email from your Shopify store to a Gmail account you control. Check three things:

Did it land in the inbox, promotions tab, or spam?
Open the email, click the three dots, and select "Show original." Look for SPF: PASS, DKIM: PASS, and DMARC: PASS in the headers.
If any of those show FAIL or NONE, your authentication is broken.

You can also use free tools like Mail Tester (mail-tester.com) or MXToolbox to run a full diagnostic. Send an email to the test address they provide, and you'll get a score out of 10 with specific issues flagged. Anything below 7 means you have work to do.

Set Up SPF, DKIM, and DMARC for Your Shopify Store

If your domain was purchased through Shopify, your authentication records are configured automatically. You can skip this section. For everyone else — and that's most merchants using GoDaddy, Namecheap, Cloudflare, or any other registrar — you need to add DNS records manually.

Step 1: Authenticate your sender domain in Shopify. Go to Settings → Notifications → Sender email. When you set up a custom sender email (like orders@yourstore.com), Shopify provides CNAME records that handle both SPF and DKIM. Add these records in your domain registrar's DNS settings exactly as Shopify specifies them.

Step 2: Add a DMARC record. Shopify's CNAME records cover SPF and DKIM, but you still need to add DMARC yourself. In your DNS settings, create a new TXT record:

Host/Name: _dmarc
Value: v=DMARC1; p=none; rua=mailto:dmarc-reports@yourstore.com
TTL: Auto or 3600

Start with p=none (monitor mode). This tells email providers you have DMARC in place without rejecting any emails. Once you've confirmed everything is working — usually after 2-4 weeks of monitoring reports — you can tighten the policy to p=quarantine or p=reject.

Step 3: Wait for propagation. DNS changes can take up to 48 hours to propagate, though most go live within a few hours. Run your "Show original" test again after 24 hours to confirm all three protocols show PASS.

One important note: if your domain already has a DMARC record with adkim=s or aspf=s (strict alignment), it can prevent Shopify's emails from authenticating properly. Switch to relaxed alignment (the default when those tags are omitted) or you'll break authentication even with correct records.

If You Use Klaviyo, Omnisend, or Another Third-Party Sender

Shopify Email uses Shopify's own sending infrastructure, so authenticating your domain in Shopify Settings covers those emails. But if you use a third-party email platform — Klaviyo, Omnisend, Mailchimp, or any other — you need to authenticate your domain with that platform separately.

Each platform has its own authentication flow. The process is similar: they give you DNS records (usually CNAME or TXT), you add them to your registrar, and the platform verifies them. If you're sending marketing emails through Klaviyo and transactional emails through Shopify, you need authentication set up with both.

The mistake merchants make is authenticating with their email marketing tool but forgetting Shopify itself. Your order confirmations and shipping notifications go through Shopify's infrastructure — if those aren't authenticated, your customers' first post-purchase touchpoint lands in spam. That's the email they're most likely to open, and it's the one building (or destroying) trust.

Keep Your Complaint Rate Below 0.1%

Authentication gets you into the inbox. Staying there depends on your complaint rate. Google requires senders to maintain a spam complaint rate below 0.1%, and anything above 0.3% triggers aggressive filtering across all your emails — not just the one that got reported.

For Shopify merchants, the most common complaint triggers are:

No clear unsubscribe link. Google requires one-click unsubscribe for all commercial emails. If people can't opt out easily, they hit "Report Spam" instead.
Emailing customers who didn't opt in. Buying an email list or adding everyone who's ever placed an order to your marketing list inflates your audience but tanks your reputation.
Sending too frequently without value. Three promotional emails a week works if every one contains something useful. If they're all "SALE SALE SALE," people report you.

Check your complaint rate in Google Postmaster Tools (free). Register your domain, and Google shows you spam rate trends, authentication status, and sending reputation — all in one dashboard. If your complaint rate is trending above 0.1%, slow down your sending and clean your list before it crosses 0.3%.

Clean Your Email List (Most Merchants Never Do This)

A dirty list is the second most common deliverability killer after missing authentication. Every bounced email, every inactive subscriber, every abandoned inbox on your list damages your sender reputation. If you're running email campaigns alongside SMS-based abandoned cart recovery, the same list hygiene principles apply to both channels.

Run a basic list hygiene pass every quarter:

Remove hard bounces immediately. These are addresses that don't exist. Most email platforms do this automatically, but verify yours does.
Suppress subscribers who haven't opened or clicked in 90 days. Don't delete them — move them to a suppressed segment. You can try a re-engagement campaign later, but stop sending regular campaigns to dead addresses.
Use double opt-in for new subscribers. It cuts your list growth by 20-30%, but the subscribers you keep are real people who actually want your emails. Your open rates and sender reputation both benefit.

A 5,000-subscriber list with 40% open rates will always outperform a 20,000-subscriber list with 8% open rates. Email providers see that 8% and conclude nobody wants your messages.

Separate Transactional and Marketing Emails

Order confirmations and shipping updates are transactional — customers expect them and almost always open them. Marketing campaigns are promotional — some people want them, some don't. Mixing both types through the same sending infrastructure means your marketing reputation affects your transactional delivery.

If your promotional campaigns get a spike in spam reports, Gmail may start filtering your order confirmations too. The fix: use Shopify's built-in notifications for transactional emails and a dedicated platform (Klaviyo, Omnisend, Shopify Email) for marketing. Each has its own sending reputation, so a bad marketing campaign doesn't tank your order confirmations. For a deeper look at building effective email flows, see our guide on Shopify email marketing flows that drive revenue.

This separation also makes diagnosis easier. If order confirmations are hitting spam, you know it's a Shopify authentication issue. If only marketing emails are affected, check your email platform's settings.

The 15-Minute Fix That Solves Most Problems

Email deliverability sounds complicated, but for most Shopify stores, the fix takes 15 minutes: authenticate your domain with SPF, DKIM, and DMARC, then verify the records are passing. That single change addresses the root cause of most spam folder issues — authentication fixes solve the majority of deliverability problems for Shopify merchants.

Start with the "Show original" test in Gmail today. If you see any FAIL or NONE results, go to your DNS settings and add the records. In 48 hours, run the test again. Your order confirmations, shipping updates, and marketing campaigns will reach the inbox instead of disappearing into a folder your customers never check.

Every email that lands in spam is a customer who thinks you never followed up. Fix authentication once, and every email you send from this point forward actually arrives.