Email Marketing Metrics That Actually Matter (Stop Obsessing Over Open Rates)

Everyone talks about open rates.

Open rates are fine. They're a health indicator, not a success metric. Your business doesn't care how many people opened your email. It cares how much revenue your emails generated.

Here's how to measure what actually matters.

The Metrics Hierarchy

Not all email metrics are created equal. Here's how to think about them:

Vanity metrics — Feel good, don't drive decisions (raw subscriber count, open rate in isolation)

Health metrics — Tell you if something's broken (deliverability rate, bounce rate, spam rate)

Performance metrics — Predict business outcomes (click rate, conversion rate, revenue per email)

The Metrics Worth Tracking

Click-Through Rate (CTR)

What it is: Percentage of recipients who clicked a link in your email.

Why it matters more than opens: Clicks require intent. Opening an email takes half a second. Clicking means you were interested enough to act.

Industry benchmark: 2-5% for B2C, 1-3% for B2B.

How to improve it: Stronger CTA, clearer value proposition, fewer competing links, better link placement.

Click-to-Open Rate (CTOR)

What it is: Clicks divided by opens. The percentage of people who clicked after opening.

Why it matters: Filters out deliverability noise. A high CTOR means your content is resonating with the people who do see it. A low CTOR means your content is disappointing after the subject line.

Target: 20-30%+ is good.

Conversion Rate

What it is: Percentage of email recipients who completed your desired action (purchase, signup, booking, etc.).

Why it matters: This is the one that connects email to revenue.

How to track it: UTM parameters on all email links. Google Analytics goals. Your email platform's e-commerce integration if applicable.

Revenue Per Email

What it is: Total revenue attributed to an email divided by the number of recipients.

Why it matters: Lets you compare the ROI of different email types and campaigns. Your welcome sequence might generate $2 per email. A promotional campaign might generate $5. Knowing this helps you invest in what works.

List Growth Rate

What it is: (New subscribers - unsubscribes) / total list size, per month.

Why it matters: A shrinking list is a dying program. You want to be growing faster than you're churning.

Healthy rate: 2-5% monthly growth after accounting for churn.

Spam Rate

What it is: Percentage of recipients who marked your email as spam.

Why it matters (critically): Gmail's threshold is 0.1%. Above 0.3% and your deliverability takes a serious hit. This is the metric that can kill your entire program.

How to keep it low: Only email people who explicitly opted in. Make unsubscribing easy (counterintuitive, but true — frustrated people who can't unsubscribe hit "spam" instead). Send relevant content.

The Metrics That Are Misleading

Open Rate (Mostly)

Apple Mail Privacy Protection broke open rate tracking for a significant chunk of your list. When a user has MPP enabled, Apple automatically loads tracking pixels — meaning "opens" are counted even when the email was never actually read.

Open rate is still useful as a relative metric (is it going up or down for your list?) but meaningless as an absolute benchmark.

Unsubscribe Rate

High unsubscribe rates can actually be healthy. It means you're being clear about what you offer and people who aren't interested are self-selecting out. A list of people who never unsubscribe but also never buy is worse than a smaller, engaged list.

Build a Dashboard That Drives Decisions

Stop checking every metric daily. Build a simple monthly dashboard:

Suplex Gives You Metrics That Matter

Suplex Mail tracks the numbers that connect your emails to your revenue — not just vanity metrics that make you feel good.

See your email program clearly for the first time.