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TL;DR: Klaviyo emails go to spam when mailbox providers distrust your domain or list engagement. Fix SPF/DKIM/DMARC and a branded sending domain first, then email engaged subscribers and clean the list. ASSUMPTION: recovery often takes weeks. Start with a Free Klaviyo Audit.
Why Klaviyo emails go to spam
Providers score authentication and engagement. Content is a smaller lever. Public provider thresholds only.
Public Gmail Yahoo Outlook requirements
Bulk senders need SPF, DKIM, DMARC, easy unsubscribe, and low complaint rates. Gmail materials commonly cite 0.3 percent as a danger zone. That is a provider rule, not a CartStrings metric.
Diagnostic checklist
- Auth pass/fail in Klaviyo
- Branded sending domain
- Complaint and bounce trends
- Engaged vs full-list gap
- Hard bounces and imports
- Content hygiene
- Consent source
Fix order
- Authenticate
- Isolate reputation and warm domain
- Shrink who you email
- Protect complaint rate
- Clean the list via the list cleaning guide
- Then tune content
See also deliverability guide and complete deliverability playbook.
When to get an agency audit
DIY if DNS and segments are clear. Get help for messy accounts or peak-season risk. CartStrings is an e-commerce email marketing agency that executes in Klaviyo. Klaviyo audit or book a call. Pricing context: how much Klaviyo costs.
FAQ
Why suddenly in spam
Usually a reputation hit from a stale list, bounce spike, or domain change.
Do SPF DKIM DMARC alone fix it
Required foundation, not enough without engagement.
Safe complaint rate
Follow public provider guidance; 0.3 percent is commonly a hard danger zone.
How long to recover
ASSUMPTION: often weeks of engaged sending after technical fixes.
Bottom line: Fix auth, email people who care, clean the list. Free Klaviyo Audit.
