My Open Rate Went From 50% To 15%. Here's What Was Happening.

> "My open rate has progressively been destroyed over the last 5 months... from just under 50% to about 15%."

When I saw this post on the Klaviyo subreddit, I felt a chill. Because the same thing had happened to me.

In September, my welcome flow had a 74% open rate. By January, it was 24%.

Same emails. Same list. Same subject lines.

What the hell happened?

The Slow Decline

At first, I didn't notice. A few percentage points here and there. I assumed it was seasonal.

By November, my campaign open rates had dropped from 35% to 25%. Concerning, but not alarming.

By December, flows were suffering too. Welcome series at 45%. Abandoned cart at 30%.

By January, everything was falling. Welcome series at 24%. Campaigns at 15%.

That's when I panicked.

The Wrong Diagnoses

I started troubleshooting. I tried everything the internet suggested:

"It's your subject lines!"

I A/B tested dozens of subject lines. Made no difference. A great subject line still got 15% opens.

"You're sending too often!"

I reduced frequency. Open rates stayed the same. Actually, they got slightly worse because my list was getting colder.

"Your content is boring!"

I redesigned my emails. Added more value. More personalization. Opens: still 15%.

Nothing was working because I was treating symptoms, not the disease.

The Real Problem

Finally, I did what I should have done from the start: I checked deliverability.

I sent test emails to myself at Gmail, Yahoo, and Outlook.

Gmail: Promotions tab (okay)

Yahoo: Primary inbox (good)

Outlook: Spam folder

For months, Outlook users—about 20% of my list—weren't seeing my emails at all. They were going straight to spam.

But the bigger issue was Gmail. Yes, I was landing in Promotions (normal). But engagement signals were telling Gmail that my emails weren't valuable.

Why? Because I was sending to people who never opened.

The Death Spiral Explained

Here's what was happening:

1. I had a lot of inactive subscribers (hadn't opened in 6+ months)

2. I kept emailing them anyway

3. They didn't open (because they weren't engaged, or my emails were going to spam)

4. Gmail/Yahoo/Outlook saw low engagement

5. They assumed my emails weren't valuable

6. More emails went to spam

7. Open rates dropped further

8. More emails went to spam

9. Repeat

> "For a small sender on a shared platform like Klaviyo, you're probably having spam folder issues due to low engagement or shared domain issues."

This was me. A death spiral I couldn't see.

The Recovery

Step 1: Immediate triage

I stopped emailing anyone who hadn't opened in 90 days. Immediately. My sendable list went from 20,000 to 12,000.

Painful? Yes. Necessary? Absolutely.

Step 2: Win-back campaign

For the 8,000 I'd suppressed, I sent a 3-email win-back sequence:

- "We miss you" + special offer

- "Last chance" reminder

- "Is this goodbye?" final attempt

About 400 people re-engaged. I kept those. The rest stayed suppressed.

Step 3: Deliverability audit

I checked:

- SPF/DKIM authentication (fine)

- Domain reputation (damaged but not blacklisted)

- Spam trap hits (none detected)

- Complaint rate (slightly high)

Main issues: engagement signals and list hygiene.

Step 4: Warm-up phase

For 3 weeks, I only emailed my most engaged subscribers (opened in last 30 days). Small sends to people who actually wanted my emails.

Open rates jumped to 40%+. Gmail started trusting me again.

Step 5: Gradual expansion

Slowly expanded to 60-day engagers, then 90-day. Watched metrics closely. Stopped immediately if engagement dropped.

The Results

After 8 weeks of recovery:

- Welcome flow open rate: 58% (was 24%)

- Campaign open rate: 32% (was 15%)

- Overall engagement: healthy

I still have a smaller "active" list than before. But that list is actually reachable.

A 58% open rate on 12,000 subscribers is worth more than 15% on 20,000.

What I'd Do Differently

1. Never let inactive subscribers pile up.

I should have been running win-back campaigns and suppressing non-engagers from the start. Not waiting until my deliverability collapsed.

2. Watch the trend, not just the number.

A slow decline over months is a warning sign. I should have acted in November, not January.

3. Check deliverability proactively.

Before my open rates crashed, I never once tested where my emails were landing. I assumed inbox. I was wrong.

4. Understand that list size is vanity.

> "That inactive customer from 2018? Billable."

I was paying Klaviyo to store subscribers who were actively hurting my deliverability. That's not an asset. That's a liability.

If Your Open Rates Are Falling

Don't wait until you're at 15% like I was.

Ask yourself:

- When did I last clean my list?

- What percentage of my list hasn't opened in 90+ days?

- Have I checked where my emails actually land?

- What's my engagement trend over the last 6 months?

Our Klaviyo Audit includes full deliverability analysis. We'll tell you if you're heading toward a death spiral—before you hit it.

Recovery is possible. But prevention is way easier.