Lesson 20 — Email Marketing, Retention & Customer Lifetime Value

AllGrowRhythm Academy · Lesson 20

Email Marketing, Retention & Customer Lifetime Value

Learn how to turn a first-time customer into a returning customer, without depending on constant new customer acquisition.

Estimated learning time: 15–20 minutes

1. Why email marketing still matters

Social media helps people discover a brand. Email gives a business a direct communication channel with people who have chosen to hear from it.

Social media Useful for discovery, visibility and public engagement.

Email Useful for follow-ups, education, repeat purchases and retention.

Important: email is not automatically better than social media. Its value depends on consent, relevance, deliverability and the quality of the message.

2. Four useful email types

Tap each type to understand when to use it.

Purpose: establish trust.

Thank the subscriber, explain what they can expect and give them one useful next step.

Example: A bookstore welcomes a subscriber and shares a short guide to choosing Bengali novels by genre.

Purpose: provide value before asking for a sale.

Teach something useful, answer a common question or curate resources for a specific interest.

Example: Recommend five beginner-friendly books on Bengali history with a short explanation of each.

Purpose: encourage a relevant purchase.

Present a clear offer, explain who it is for and state the terms honestly. Avoid fake urgency.

Example: Share a curated reading bundle with its price, availability and delivery conditions.

Purpose: bring existing customers back when it makes sense.

Follow up after a purchase, suggest complementary products or share something connected to the customer's previous interest.

Example: After a customer buys a mystery novel, recommend other mystery titles rather than sending unrelated offers.

3. Design a customer retention journey

A customer journey is a sequence of useful interactions, not a series of repeated sales messages.

Explain what subscribers will receive. Obtain appropriate consent and make unsubscribing easy.

Send a welcome message with relevant information. Do not overwhelm a new subscriber with multiple offers.

Confirm the order, share practical information and make customer support easy to access.

Check whether the customer needs help. Suggest complementary products only when they are relevant.

Use customer preferences and purchase patterns to make future communication more relevant. Measure actual repeat purchases.

4. Understand Customer Lifetime Value (CLV)

Customer Lifetime Value estimates the value a business earns from a customer over the relationship. For practical planning, use contribution after variable costs rather than revenue alone.

Average number of purchases per customer Average order value (₹) Contribution margin (%) Acquisition cost per customer (₹)

Estimated contribution over customer lifetime: ₹1,120
Estimated contribution after acquisition cost: ₹870

Formula used: lifetime contribution = purchases × average order value × contribution margin. Net contribution after acquisition = lifetime contribution − acquisition cost. This simplified estimate excludes discounting, fixed overheads and changes in future behaviour.

5. Which metrics should you track?

Click-through rate Measures the share of delivered emails that generate clicks, using a consistently defined denominator.

Conversion rate Measures how many recipients or visitors complete the desired action.

Repeat purchase rate Measures how many customers purchase again during a defined period.

Unsubscribe rate Helps identify whether frequency, relevance or expectations may be a problem.

Do not judge an email campaign on open rate alone. Privacy features and automated email loading can make opens unreliable. Prioritise clicks, conversions, revenue, repeat purchases and customer feedback.

6. Build a simple 7-day action plan

Day 1: Define your ideal customer and retention objective. Day 2: Decide what subscribers will receive and how consent will be recorded. Day 3: Draft a welcome email with one clear next step. Day 4: Create one genuinely useful educational email. Day 5: Map the post-purchase follow-up. Day 6: Set up tracking for clicks, conversions and repeat orders. Day 7: Review results and decide what to improve next.

0 of 7 tasks completed.

7. Quick knowledge check

Question 1: What is the main purpose of a retention email?

Send the same offer repeatedly. Build a useful ongoing relationship and encourage relevant repeat purchases. Increase follower count on every platform.

Question 2: Which is the better simplified CLV estimate for profitability planning?

Revenue only, without considering costs. Contribution after variable costs, with acquisition cost considered separately. The number of email subscribers.

Question 3: What should a business do if subscribers regularly ignore irrelevant emails?

Increase the sending frequency immediately. Review relevance, audience segments and frequency. Ignore all campaign data.

Your score will appear here.

8. Key takeaway

Good retention marketing is not about sending more messages. It is about sending the right message to the right person at the right time, then measuring whether it improves the customer relationship and business results.

Your next step: Choose one customer segment and design a useful welcome-to-repeat-purchase journey for it.

Lesson 20 completed. You can now apply the 7-day action plan.

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