Writing effective subject lines in Digital Marketing - Mini Project: Build & Apply

Writing Effective Subject Lines

📖 Scenario: You work for a small online store that sends weekly email newsletters to customers. Your goal is to create subject lines that catch attention and encourage people to open the emails.

🎯 Goal: Build a list of email subject lines, set a rule to pick the best ones, filter the list based on that rule, and finalize the chosen subject lines for sending.

📋 What You'll Learn

Create a list of 5 exact subject lines

Add a minimum length threshold variable

Filter the subject lines to keep only those longer than the threshold

Add a final confirmation message variable

💡 Why This Matters

🌍 Real World

Effective email subject lines increase the chance that customers open marketing emails, improving engagement and sales.

💼 Career

Marketing professionals often need to craft and test subject lines to optimize email campaign performance.

1

Create the list of subject lines

Create a list called subject_lines with these exact entries: 'Big Sale Today!', 'New Arrivals Just In', 'Last Chance to Save', 'Exclusive Offer Inside', and 'Your Weekly Update'.

Digital Marketing

# Create the list of subject lines
# Your code here

Hint

Use square brackets [] to create a list and separate each subject line with commas.

2

Set the minimum length threshold

Create a variable called min_length and set it to 15 to represent the minimum number of characters a subject line should have.

Digital Marketing

subject_lines = ['Big Sale Today!', 'New Arrivals Just In', 'Last Chance to Save', 'Exclusive Offer Inside', 'Your Weekly Update']
# Set the minimum length threshold
# Your code here

Hint

Just assign the number 15 to the variable min_length.

3

Filter subject lines by length

Create a new list called filtered_subjects that includes only the subject lines from subject_lines whose length is greater than min_length. Use a list comprehension with for subject in subject_lines and check len(subject) > min_length.

Digital Marketing

subject_lines = ['Big Sale Today!', 'New Arrivals Just In', 'Last Chance to Save', 'Exclusive Offer Inside', 'Your Weekly Update']
min_length = 15
# Filter the subject lines by length
# Your code here

Hint

Use a list comprehension to check each subject's length and keep only those longer than min_length.

4

Add the final confirmation message

Create a variable called final_message and set it to the string 'Subject lines ready to send!' to confirm the selection is complete.

Digital Marketing

subject_lines = ['Big Sale Today!', 'New Arrivals Just In', 'Last Chance to Save', 'Exclusive Offer Inside', 'Your Weekly Update']
min_length = 15
filtered_subjects = [subject for subject in subject_lines if len(subject) > min_length]
# Add the final confirmation message
# Your code here

Hint

Assign the exact string to final_message to complete the project.

Practice

1. Which of the following is the most important quality of an effective email subject line?

easy

A. It is clear and easy to understand

B. It uses complicated words to impress readers

C. It is very long to include all details

D. It avoids any call to action

Solution

1. Step 1: Understand the purpose of a subject line

   The subject line should quickly tell the reader what the email is about.

2. Step 2: Evaluate the options for clarity

   Only It is clear and easy to understand describes a clear and easy to understand subject line, which is key to effectiveness.

3. Final Answer:

   It is clear and easy to understand -> Option A

4. Quick Check:

   Clear subject line = Effective subject line [OK]

Hint: Choose the option that emphasizes clarity and simplicity [OK]

Common Mistakes:

• Choosing long or complicated subject lines
• Ignoring clarity for fancy words
• Thinking length equals effectiveness

2. Which of the following is the correct way to write a subject line that creates urgency?

easy

A. Check out our products anytime

B. Our sale is available next month

C. Don't miss out on our sale!

D. We have a sale, maybe

Solution

1. Step 1: Identify urgency in subject lines

   Urgency means encouraging immediate action or attention.

2. Step 2: Compare options for urgency

   Don't miss out on our sale! uses "Don't miss out" which creates a sense of urgency, unlike the others.

3. Final Answer:

   Don't miss out on our sale! -> Option C

4. Quick Check:

   Urgency phrase = "Don't miss out" [OK]

Hint: Look for words that push quick action or fear of missing out [OK]

Common Mistakes:

• Choosing vague or future-dated phrases
• Ignoring words that create urgency
• Selecting neutral or uncertain wording

3. Consider this subject line: "John, your exclusive offer expires today!" What effect does this subject line most likely have?

medium

A. It feels personal and urgent, encouraging immediate action

B. It is too long and confusing, so readers ignore it

C. It sounds generic and unimportant

D. It lacks any call to action or interest

Solution

1. Step 1: Analyze personalization and urgency

   The subject line uses the reader's name and mentions an offer expiring today, adding urgency and personalization.

2. Step 2: Understand reader impact

   Personal and urgent messages tend to get more attention and prompt quicker responses.

3. Final Answer:

   It feels personal and urgent, encouraging immediate action -> Option A

4. Quick Check:

   Personalization + urgency = higher engagement [OK]

Hint: Spot names and deadlines for personal urgency [OK]

Common Mistakes:

• Ignoring the effect of personalization
• Thinking length always reduces interest
• Missing urgency cues like 'expires today'

4. A marketer wrote this subject line: "Sale Sale Sale Sale Sale!" but noticed low open rates. What is the main problem?

medium

A. It creates too much urgency

B. The subject line is repetitive and looks spammy

C. It uses a person's name incorrectly

D. It is too short and lacks details

Solution

1. Step 1: Identify issues with repetition

   Repeating the same word multiple times can seem spammy and annoying to readers.

2. Step 2: Understand impact on open rates

   Spammy-looking subject lines reduce trust and lower open rates.

3. Final Answer:

   The subject line is repetitive and looks spammy -> Option B

4. Quick Check:

   Repetition = Spammy impression [OK]

Hint: Avoid repeating words to prevent spam filters [OK]

Common Mistakes:

• Thinking urgency means repeating words
• Ignoring how repetition affects trust
• Assuming short means effective always

5. You want to write a subject line for a newsletter that shares helpful tips and also includes the recipient's first name. Which subject line is best?

hard

A. "Don't miss our sale ending soon"

B. "Morning routine tips you might like"

C. "Exclusive offer just for you"

D. "Anna, 5 quick tips to improve your morning routine"

Solution

1. Step 1: Match subject line to content and personalization

   The newsletter shares helpful tips and personalization, so the subject line should reflect both.

2. Step 2: Evaluate options for relevance and personalization

   "Anna, 5 quick tips to improve your morning routine" includes the recipient's name and clearly states helpful tips, matching the goal perfectly.

3. Final Answer:

   "Anna, 5 quick tips to improve your morning routine" -> Option D

4. Quick Check:

   Personalized + helpful info = best subject line [OK]

Hint: Combine name and clear benefit for best results [OK]

Common Mistakes:

• Choosing generic or unrelated subject lines
• Ignoring personalization when possible
• Using urgency when content is informational