How to Fix Email Deliverability in Klaviyo Before It Costs You Q4

What Is Email Deliverability in Klaviyo and Why It Matters

Email deliverability is whether your emails actually land in the inbox or disappear into spam.

You can write a perfect email with a killer offer and a subject line that would make any copywriter proud. But if it lands in spam, nobody sees it. Zero opens, zero clicks, zero revenue.

Most dropshippers discover they have an email deliverability problem in Klaviyo right before Q4. That is the worst possible time to find out.

How Gmail and Outlook Score Your Emails

Every email you send gets scored by Gmail and Outlook. They track:

• Open rate: the percentage of recipients who open your email
• Click rate: the percentage who click a link inside
• Spam report rate: the percentage who mark your email as spam
• Unsubscribe rate: the percentage who opt out after receiving your email

Low engagement on any of these signals tells Gmail that your emails are not wanted. Your sender score drops. Your next email is more likely to land in spam. And the one after that. It compounds fast.

The Clear Warning Signs of a Deliverability Problem

The most reliable signal: Klaviyo open rates below 20%.

Industry average open rates in Klaviyo are 37 to 48% for flows and 30 to 38% for campaigns. If your open rate is below 20%, your emails are not reaching the inbox.

Other warning signs:

• Campaigns that used to perform well are suddenly underperforming
• Unsubscribe rates are climbing above 0.5% per send
• You are getting customer replies asking “why am I getting this email?” (spam folder survivors who check occasionally)
• Revenue from email drops sharply even though your list size is the same

Any one of these signals warrants an immediate deliverability check.

Why Deliverability Problems Get Worse Before Q4

Q4 is the highest-volume sending period of the year. You send more often. You hit more of your list.

If your sender reputation is already damaged, the increased volume makes it worse. More sends to disengaged contacts means more low-engagement signals to Gmail. Your score drops faster.

Every bad send in September and October hurts your November deliverability. Fix it now, not when it is already costing you Black Friday revenue.

How to Fix Email Deliverability in Klaviyo Step by Step

This is the exact process Ecomflows uses across 2,000+ stores to recover deliverability. It works. It just requires patience.

Step 1: Identify Your Current Sending Reputation

Start by looking at your Klaviyo analytics. Check open rates for the last 30 days across all flows and campaigns.

• Above 30%: reputation is healthy, no urgent action needed
• 20 to 30%: early warning zone. Monitor closely and tighten your segmentation.
• Below 20%: active deliverability problem. Stop broad sends immediately and start the recovery process below.

Step 2: Build an Engaged Segment and Send Only to That

Create a segment in Klaviyo of contacts who opened or clicked an email in the last 30 days.

This is your cleanest, most engaged audience. They have demonstrated they want your emails.

For the next 2 to 4 weeks, send campaigns only to this segment. Your open rates will jump. Gmail will see strong engagement signals. Your reputation starts to recover.

Step 3: Expand Gradually as Rates Improve

Once your open rates consistently stay above 30%, expand your sending segment to contacts who engaged in the last 60 days.

Keep monitoring. If rates hold, expand to 90 days. Then 120 days. Each expansion should only happen when open rates are stable and strong.

This gradual warm-up rebuilds your reputation with Gmail and Outlook. It takes 4 to 6 weeks to fully recover from a serious deliverability problem.

Step 4: Set Up a Verified Branded Sending Domain

Sending from a generic address like store@gmail.com or using Klaviyo’s default sending domain is one of the fastest ways to damage deliverability.

Set up a verified, branded sending domain. For example: hello@yourstore.com, configured in Klaviyo’s sending settings.

This tells Gmail and Outlook that you are a legitimate sender with an established domain. It is a basic requirement for healthy deliverability, not an optional extra.

Step 5: Never Send From a New Domain

New domains have no sender history. Gmail does not know who you are. The default assumption is low trust.

If you recently migrated stores, rebranded, or switched email platforms, your sending domain might be newer than you think.

The older your sending domain, the better your starting deliverability. Always use an aged, verified domain for email marketing sends.

How to Keep Deliverability Healthy Long-Term

Fixing deliverability is not a one-time project. It is an ongoing practice. Here is what healthy email marketing hygiene looks like.

• Suppress contacts who have not opened an email in 180 days. They are dragging down your engagement metrics.
• Never buy email lists. Purchased contacts have no relationship with your brand and will mark your emails as spam.
• Set up a double opt-in or strong opt-in process for new subscribers. A smaller, more engaged list outperforms a large, disengaged one.
• Monitor your unsubscribe rate per send. Above 0.5% consistently means your content is not relevant to your segment.
• Use Klaviyo’s deliverability health dashboard to track your sender score before Q4.

What Good Klaviyo Open Rates Look Like

To give you a clear target, here are benchmarks from Klaviyo’s 2024 data and from Ecomflows’ experience across 2,000+ stores.

• Flows: 37 to 48% average open rate. Top 10% of performers hit above 55%.
• Campaigns: 30 to 38% average open rate. Top performers hit above 45%.
• Below 20% for either: active deliverability problem requiring immediate action.

Use these as your targets. If your numbers are below the averages, start the recovery process now. Do not wait for Q4.