Email deliverability for Shopify brands: DKIM, SPF and DMARC in plain English

Is your Shopify store sending gorgeous emails that nobody reads? No matter how well-crafted your message or how tempting the offer, if it lands in spam, it’s dead money. That’s where the ugly but crucial world of email deliverability comes in—specifically, DKIM, SPF, and DMARC. These three acronyms may sound like tech gobbledygook, but they form the foundation to stop your emails getting bounced or buried.

What exactly are SPF, DKIM, and DMARC, and why should Shopify brands care?

At its core, email deliverability is about trust. Email providers like Gmail, Yahoo, and Outlook want to know you’re not a spammer or a phisher. SPF, DKIM, and DMARC are ways you prove you’re legit:

• SPF (Sender Policy Framework) is a list of servers allowed to send mail for your domain. It’s like a guest list for your email party. If the server sending that email isn’t on the list, email providers might toss the message in the trash or spam folder.

• DKIM (DomainKeys Identified Mail) adds a digital signature to your email. Think of it as a wax seal on a letter proving the sender—and that the message hasn’t been tampered with.

• DMARC (Domain-based Message Authentication, Reporting & Conformance) tells email providers what to do if SPF or DKIM checks fail. It’s your policy for handling suspicious emails—should they send the email to spam, reject it outright, or let it slide? It also lets you get reports on who’s trying to impersonate you.

Without these, your email is basically a stranger knocking on inbox doors with no ID. Most modern email providers either silently ignore or actively punish this, sending your hard-earned marketing copy to the spam abyss.

Why can’t I just send emails without worrying about these records?

Sure, you could send marketing emails without SPF, DKIM, or DMARC, but it’s a bit like shouting into a hurricane. According to the Baymard Institute, about 70% of online carts get abandoned on average. When you finally convince a shopper to come back, the last thing you want is an abandoned-cart reminder stuck in their spam folder.

Email providers are tightening their filters every day to protect their users. If your domain isn’t authenticated properly, your messages may not just land in spam—they may be blocked entirely or flagged as phishing. That costs you real revenue, because a sale lost in spam is zero dollars in your pocket.

How do I set up SPF, DKIM, and DMARC for my Shopify brand in simple terms?

Most of this setup happens in your DNS—the system that tells the internet where to find your website and email servers. DNS management varies by domain registrar (like GoDaddy, Namecheap, Google Domains), but the steps are generally:

• SPF: Add a TXT record listing authorized email senders for your domain. Shopify and popular email providers like Klaviyo provide exact TXT record entries you need.

• DKIM: Your email service generates a pair of cryptographic keys. You add the public key as a TXT DNS record; the private key sits on the sending server to sign outgoing emails.

• DMARC: Add a TXT record defining your policy (none, quarantine, reject) and an email address for reports. Start with “none” to monitor before enforcing strict blocks.

If this feels overwhelming, Shopify has some automatic or guided email setup for its native emails. But if you’re using third-party apps (like an abandoned-cart email flow in Klaviyo), double-check they provide instructions or a wizard to copy DNS records. You usually just copy-paste records into your DNS dashboard.

What happens if I mess up the setup or ignore these technologies altogether?

The risk is… your emails vanish or don’t get clicked. Senders with missing or misconfigured SPF/DKIM often suffer:

• Emails landing straight into spam folders or promotions tabs.

• Email rejections and bounce-backs, hurting your sender reputation.

• Your domain potentially being hijacked by spammers pretending to be you (spoofing).

Reputations take time to build and seconds to break. Once email providers see failures, it can take weeks to recover. Plus, lost emails mean lost customers who did not recover abandoned carts or receive critical retention messages.

Can I test if my SPF, DKIM, and DMARC records are set up correctly?

Yes, and you should. Here’s a quick checklist:

• Use free online tools like MX Toolbox or DMARC Analyzer to check your DNS records.

• Send test emails to Gmail or Outlook, then check email headers to see if SPF and DKIM pass.

• Monitor DMARC reports if you’ve enabled them—these show if anyone is spoofing your domain.

• Use Shopify’s or your email provider’s diagnostic tools—they often notify you about missing or incorrect records.

What practical steps can Shopify brands take right now?

• Verify your domain’s SPF and DKIM records include every service that sends emails on your behalf (Shopify, Klaviyo, Segan AI Agent, etc.)

• Add a DMARC record with a “none” policy first. Check reports regularly, then gradually ramp to “quarantine” or “reject” as you confirm legit flows.

• Keep your DNS records clean and up to date whenever you add or remove email services.

• If you rely on abandoned-cart and retention emails, make sure your email marketing platform supports authenticated sending and guides you through setup. It’s your gateway from cart abandonment to conversion.

Email deliverability checklist for Shopify brands

• Confirm your domain’s SPF record authorizes all email senders you use.

• Add or verify your DKIM record in DNS for every service sending email from your domain.

• Create a DMARC record starting with policy “none” to monitor email authentication.

• Test your setup with free online DNS and email header tools.

• Regularly monitor DMARC reports and email performance metrics.

• Update DNS records if you start or stop using email services (shopify emails, Klaviyo, etc.).

• Use an email marketing app that supports and helps you maintain SPF, DKIM, and DMARC.

If remembering these steps feels like a trip down tech rabbit holes, starting with a dedicated retention and recovery flow designed for Shopify in Klaviyo is a good move. It not only captures abandoned carts but also prioritizes deliverability setup, so you’re not sending emails blind.

To explore a system that integrates retention with deliverability best practices, check out our DTC Retention / The 5-Flow Recovery Engine.

Deliverability isn’t sexy, but it is essential. A beautiful email in spam recovers $0. Make sure your emails clear the technical hurdles first—then your storytelling and offers have a chance to do their thing.