Every Klaviyo deliverability problem, covered.
20 guides written by practitioners. Authentication, reputation, spam filtering, list hygiene, inbox placement. Pick the one that matches what you are debugging right now, or start with a free audit of your sending domain.
Klaviyo Posture Report
Public signals: DNS, SPF, DKIM, DMARC, blocklist, domain reputation. No API key needed.
Get Free Report €49 · 24–48hKlaviyo Trial Audit
Data-connected: 7 days of real Klaviyo sending data analysed by AI, written report returned.
Get Trial Audit Starting at €750/monthKlaviyo Autonomous AI Intelligence
Continuous AI monitoring: auth drift, reputation, engagement. Plain-English findings.
See PricingGet your DNS, signing keys, and IP infrastructure right before anything else.
Shared IP or Dedicated IP for Klaviyo
Volume thresholds, warming reality, and when dedicated actually helps deliverability.
Read guide →Klaviyo Dedicated Sending Domain Setup
Why, how, and the migration trap that silently hurts delivery when rushed.
Read guide →Klaviyo DKIM Failing or Not Aligned
The usual causes (CNAME not pointing, key rotation, DMARC alignment) and the step-by-step fix.
Read guide →Klaviyo DMARC Setup Guide
From p=none to p=reject: the three-stage progression, how to read reports, and Klaviyo-specific failure modes.
Read guide →How to Warm Up a Dedicated Klaviyo IP
Week-by-week schedule, per-ISP ramp, and how to catch a bad warming before it compounds.
Read guide →Why mail ends up in spam, Junk, or the Promotions tab, and what actually moves the needle.
Why Are My Klaviyo Emails Going to Spam?
A seven-cause diagnostic walkthrough, ranked by frequency, with specific fixes for each.
Read guide →Klaviyo Emails Blocked by Gmail
The four distinct modes of Gmail blocking, how to tell them apart, and 2024 bulk-sender rule context.
Read guide →Klaviyo Emails Blocked by Yahoo and AOL
Yahoo's 2024 enforcement rules, the complaint-rate cliff, and how to recover.
Read guide →Klaviyo Emails in the Gmail Promotions Tab
Honest take: Promotions is usually correct for marketing mail. When it isn't, here's the fix.
Read guide →Klaviyo Abandoned Cart Going to Spam
Why cart flows get filtered more than other sends, and the five-step fix sequence.
Read guide →Reading the signals that tell you how ISPs are treating your sending domain and IP.
Klaviyo Sender Reputation: How to Check It
The four layers of sender reputation, what a Klaviyo customer can actually see, and what only Klaviyo can see.
Read guide →Why Did My Klaviyo Open Rate Drop Suddenly?
Separating real deliverability decline from Apple MPP artifacts and ISP algorithm shifts.
Read guide →Why Is My Klaviyo Bounce Rate So High?
How to read bounce codes, the four root causes, and what to do in the first hour.
Read guide →Klaviyo Bounce Codes Explained
The SMTP error reference: what every code means, which indicate list problems vs reputation problems.
Read guide →Klaviyo IP Blocklisted or Blacklisted
The major blocklists, what Klaviyo customers can check directly, and the correct escalation path.
Read guide →Why Are My Klaviyo Emails Being Deferred?
What deferrals actually are, the five common causes, and when to act vs let retry logic resolve it.
Read guide →Klaviyo Emails Bouncing at Outlook and Microsoft
The Microsoft-specific playbook: S3150 explained, what signals are available, Microsoft 2024-2026 context.
Read guide →Why the lists you send to matter as much as the content you send.
What tools actually work for Klaviyo deliverability and what each is genuinely best at.