Key Email Metrics (Open Rate, CTR, Unsubscribe Rate)
Email metrics are the feedback loop that tells you what's working and what isn't. But interpreting them correctly requires understanding what each metric actually measures, what affects it beyond your control (like iOS mail privacy protection), and what action each metric signals. Optimizing for the wrong metric leads to the wrong decisions.
40 min•By Priygop Team•Updated 2026
The Core Email Metrics
- Open Rate: (Emails opened / Emails delivered) × 100. Industry average: 20-40% (varies by industry). Note: iOS Mail Privacy Protection inflates open rates by pre-loading pixels. Apple Mail users appear as 'opened' even if they didn't read it. Use click rate as a more reliable engagement metric.
- Click Rate (CTR): (Unique clicks / Emails delivered) × 100. Measures content relevance and CTA effectiveness. Average: 2-4%. Good: 5%+. Below 1%: content or CTA is misaligned with audience.
- Click-to-Open Rate (CTOR): (Clicks / Opens) × 100. Measures how compelling the email content is for people who opened it. Average: 10-15%. Below 10%: the email body isn't convincing enough after the subject line delivers.
- Conversion Rate: (Conversions from email / Emails delivered) × 100. The most important metric for promotional campaigns. Track via UTM parameters + GA4 or your platform's revenue attribution.
- Unsubscribe Rate: (Unsubscribes / Emails delivered) × 100. Healthy: below 0.5% per send. Above 1%: content relevance, frequency, or expectation mismatch issue.
- Bounce Rate: Hard bounces (permanent delivery failures) + soft bounces (temporary). Keep hard bounce rate below 2%. Above that harms deliverability.
Revenue Metrics (The Bottom-Line Performance Indicators)
- Revenue Per Email (RPE): Total revenue generated / Emails sent. A $3 RPE on a 10,000-list size = $30K per send. Track this for every promotional send to understand your list's revenue value.
- Revenue Per Subscriber (RPS): Total revenue from email / List size. Your e-commerce benchmark: $1-$5/subscriber/month is healthy. Top DTC brands see $5-$15/subscriber/month from email alone.
- Email-attributed revenue: Use UTM parameters on all email links + GA4 source tracking to see what % of your total revenue comes from email campaigns vs flows/automations.
- Klaviyo/ActiveCampaign attribution: Most email platforms show direct revenue attribution per email, flow, and campaign. This is your primary KPI for the whole channel.
Practical Exercise — 5-Email Welcome Sequence Builder
Practical Exercise — 5-Email Welcome Sequence Builder
Use this fill-in-the-blank template to build your own welcome sequence. Replace [ ] with your specifics:
// EMAIL 1 — Immediate (0 minutes after sign-up)
Subject: Your [lead magnet name] is here — plus what's coming
Body: Hey [First Name], your [lead magnet] is attached/linked below.
Over the next [X] days, I'll share [promise: e.g., 'the exact strategies we used to 10x our email open rate'].
[Link to lead magnet]
— [Your Name]
// EMAIL 2 — Day 2 (Authority Builder)
Subject: The [result] we almost didn't share
Body: [Share your single best piece of content — best blog post, case study, insight.]
Key takeaway: [one sentence summary].
[Link to full content]
// EMAIL 3 — Day 4 (Brand Story)
Subject: Why I started [company/project]
Body: [Tell your origin story in 150–200 words. What problem were YOU trying to solve?]
This is why we built [product/service] — to help people like you [achieve outcome].
// EMAIL 4 — Day 6 (Problem Agitation)
Subject: The #1 mistake [your audience] makes with [topic]
Body: [Describe the core pain your audience faces in their own language.]
The good news: there's a better way — and I'll share it tomorrow.
// EMAIL 5 — Day 8 (Soft Offer)
Subject: Here's how we can help
Body: If you want to [achieve outcome], [product/service] is built for exactly that.
→ [Key benefit #1]
→ [Key benefit #2]
→ [Key benefit #3]
[CTA: 'Get started / Learn more / Book a call']
Questions? Just reply to this email.
// DELIVERABILITY CHECKLIST BEFORE SENDING:
□ From: Real person name (e.g., 'Sarah from Priygop')
□ Reply-to: A monitored, real inbox
□ One-click unsubscribe link in footer (required by Gmail/Yahoo 2024 rules)
□ Plain text version enabled in your ESP
□ Preheader text set (extends the subject line in inbox preview)
□ A/B test subject lines on Emails 1 & 5 (highest-impact sends)Quick Quiz — Email Marketing & Automation
Tip
Tip
Practice Key Email Metrics Open Rate CTR Unsubscribe Rate in small, isolated examples before integrating into larger projects. Breaking concepts into small experiments builds genuine understanding faster than reading alone.
Diagram
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Open rate > 25% = great. Click rate > 3% = engaged list. Clean list quarterly. Segment for results.
Practice Task
Note
Practice Task — (1) Write a working example of Key Email Metrics Open Rate CTR Unsubscribe Rate from scratch without looking at notes. (2) Modify it to handle an edge case (empty input, null value, or error state). (3) Share your solution in the Priygop community for feedback.
Common Mistake
Warning
A common mistake with Key Email Metrics Open Rate CTR Unsubscribe Rate is skipping edge case testing — empty inputs, null values, and unexpected data types. Always validate boundary conditions to write robust, production-ready digital marketing code.
Key Takeaways
- Email metrics are the feedback loop that tells you what's working and what isn't.
- Open Rate: (Emails opened / Emails delivered) × 100. Industry average: 20-40% (varies by industry). Note: iOS Mail Privacy Protection inflates open rates by pre-loading pixels. Apple Mail users appear as 'opened' even if they didn't read it. Use click rate as a more reliable engagement metric.
- Click Rate (CTR): (Unique clicks / Emails delivered) × 100. Measures content relevance and CTA effectiveness. Average: 2-4%. Good: 5%+. Below 1%: content or CTA is misaligned with audience.
- Click-to-Open Rate (CTOR): (Clicks / Opens) × 100. Measures how compelling the email content is for people who opened it. Average: 10-15%. Below 10%: the email body isn't convincing enough after the subject line delivers.