Email marketing delivers an average return of $36 to $42 for every $1 spent, making it the highest-ROI digital channel available to most businesses. But that ROI is not automatic. It depends entirely on how well you write the emails. Bad copy, vague subject lines, and missing calls to action lose campaigns before they even start. This guide covers exactly how to write email for marketing, from the first line a subscriber sees to the click that converts.
Key Takeaways
On average, businesses make about $36 for every $1 they spend on email marketing.
Subject line clarity drives opens more than cleverness; your preheader text is a second chance to earn the click.
Personalization in email messages improves open rates by 29% and click-through rates by 41%, and personalized subject lines alone increase open rates by 26%.
Every marketing email needs one clear goal and one primary CTA.
Automated workflows generate 320% more revenue than standard promotional campaigns.
Segmentation, testing, and measurement separate consistently performing programs from one-off campaigns.
Why the Writing Quality of Your Marketing Emails Actually Matters
The average professional receives over 120 business emails daily, which means your message needs to capture attention immediately and deliver clear value. Most emails fail not because the offer is wrong, but because the writing is unfocused, generic, or treats the reader like a number.
42% of marketers say email is their most effective channel, far ahead of social media and paid search, which both sit at just 16%. In 2024, 50% of consumers said they purchased directly from an email, more than from social media posts or ads.
That volume and purchase influence makes writing quality a direct revenue lever. A better subject line earns more opens. A tighter body earns more clicks. A clear CTA earns more conversions.
Step 1: Define the Goal Before You Write a Word
Every marketing email should serve one purpose. That purpose determines the subject line, the body copy, the CTA, and the segment you send to. If you sit down to write before defining the goal, you will write an email that tries to do too many things and accomplishes none of them.
Email marketing delivers an average return of $36 to $42 for every $1 spent, making it the highest-ROI digital channel available to most businesses. But that ROI is not automatic. It depends entirely on how well you write the emails. Bad copy, vague subject lines, and missing calls to action lose campaigns before they even start. This guide covers exactly how to write email for marketing, from the first line a subscriber sees to the click that converts.
Key Takeaways
On average, businesses make about $36 for every $1 they spend on email marketing.
Subject line clarity drives opens more than cleverness; your preheader text is a second chance to earn the click.
Personalization in email messages improves open rates by 29% and click-through rates by 41%, and personalized subject lines alone increase open rates by 26%.
Every marketing email needs one clear goal and one primary CTA.
Automated workflows generate 320% more revenue than standard promotional campaigns.
Segmentation, testing, and measurement separate consistently performing programs from one-off campaigns.
Why the Writing Quality of Your Marketing Emails Actually Matters
The average professional receives over 120 business emails daily, which means your message needs to capture attention immediately and deliver clear value. Most emails fail not because the offer is wrong, but because the writing is unfocused, generic, or treats the reader like a number.
42% of marketers say email is their most effective channel, far ahead of social media and paid search, which both sit at just 16%. In 2024, 50% of consumers said they purchased directly from an email, more than from social media posts or ads.
That volume and purchase influence makes writing quality a direct revenue lever. A better subject line earns more opens. A tighter body earns more clicks. A clear CTA earns more conversions.
Step 1: Define the Goal Before You Write a Word
Every marketing email should serve one purpose. That purpose determines the subject line, the body copy, the CTA, and the segment you send to. If you sit down to write before defining the goal, you will write an email that tries to do too many things and accomplishes none of them.
Common goals include:
Driving a purchase or trial
Nurturing a lead toward a decision
Re-engaging inactive subscribers
Announcing a product update or feature
Delivering value to maintain list health
Do not clutter your emails with multiple messages. Although you want to include multiple calls to action, they should all lead to the same place and meet one overall marketing strategy objective.
Write the goal in one sentence before you draft anything else. Everything you write either serves that goal or it does not belong in the email.
Step 2: Know Who You Are Writing For
The first and most important question every email marketer needs to answer is: who am I writing for? Answering that question means creating customer personas.
Personas are not decoration. They determine the tone, the pain points you address, the vocabulary you use, and the level of detail that is appropriate. An email to a senior engineer should read differently from an email to a small business owner, even if both are promoting the same product.
The more you can find out about the people on your email list through market research, the better you can tailor the email marketing message to meet their needs and solve their problems. Content relevancy is the key to email marketing success. That is why it is important to use personalization and email list segmentation to avoid sending a blanket email.
The subject line is the single highest-leverage element in an email. Perfecting your subject lines is the single most important way to increase your email open rates. Compelling subject lines can be the difference between recipients opening your email, deleting it, or, even worse, reporting it as spam.
Follow these principles:
Common goals include:
Driving a purchase or trial
Nurturing a lead toward a decision
Re-engaging inactive subscribers
Announcing a product update or feature
Delivering value to maintain list health
Do not clutter your emails with multiple messages. Although you want to include multiple calls to action, they should all lead to the same place and meet one overall marketing strategy objective.
Write the goal in one sentence before you draft anything else. Everything you write either serves that goal or it does not belong in the email.
Step 2: Know Who You Are Writing For
The first and most important question every email marketer needs to answer is: who am I writing for? Answering that question means creating customer personas.
Personas are not decoration. They determine the tone, the pain points you address, the vocabulary you use, and the level of detail that is appropriate. An email to a senior engineer should read differently from an email to a small business owner, even if both are promoting the same product.
The more you can find out about the people on your email list through market research, the better you can tailor the email marketing message to meet their needs and solve their problems. Content relevancy is the key to email marketing success. That is why it is important to use personalization and email list segmentation to avoid sending a blanket email.
The subject line is the single highest-leverage element in an email. Perfecting your subject lines is the single most important way to increase your email open rates. Compelling subject lines can be the difference between recipients opening your email, deleting it, or, even worse, reporting it as spam.
Follow these principles:
Clarity first. Write a subject line that is clear first and catchy second. In marketing copy, clarity should always be your priority. If, after you have drafted a clear subject line, you can also make it catchy, funny, or whimsical, then go for it.
Keep it short. Email subject lines with fewer than 70 characters have the highest open rates, which analysts attribute to their optimization for mobile device display.
Align with email content. According to Gartner, subject lines that are misaligned with email content are one of the top three reasons subscribers choose to leave an email list.
Use personalization. Personalized subject lines boost email open rates by up to 20 to 29%.
Do Not Forget the Preheader
The preheader is the short text that appears after the subject line in the inbox view. Most marketers underuse it.
Studies have shown that including a preheader can increase open rates by up to 30%. This is because preheaders provide additional information about the email content, which can entice the recipient to open the email.
On mobile devices, your email preheader text is often more prominent than the subject line. Keep it between 40 and 80 characters, and make it complement, not repeat, the subject line. Your preheader should feel like a natural continuation of your subject line, not a separate thought.
For a deeper look at what moves open rate numbers, read Email Subject Line Best Practices That Boost Open Rates by 27%.
Step 4: Write Body Copy That Keeps the Reader Moving
Once someone opens your email, your body copy has one job: keep them reading until they reach the CTA. There is no trick to this. It is about relevance, brevity, and voice.
Lead with the reader's problem or benefit
Keep the focus of your email marketing copywriting on your recipients, rather than providing too much unnecessary information about yourself and your company. People who subscribe to get your emails are more interested in how the products provided by your business can meet their needs and be helpful to them. So be more customer-centric by using the word "you" more than referring to "I," "me," "we," and "us" in your email copy.
Use a conversational tone
Marketing emails perform best when they sound like they are from a person, not a corporation. Use natural language, contractions, and a tone that matches how you would speak to your audience in person. Avoid industry jargon unless your audience expects it, and eliminate unnecessarily complex terms. Ask questions, use second-person pronouns, and maintain an authentic voice that reflects your brand personality.
Keep copy scannable
Most subscribers skim before they read. Use short paragraphs of two to three lines. Use bullets to break up lists of features or benefits. Bold key terms sparingly. The structure should guide the eye downward toward the CTA.
A study by the email marketing platform Constant Contact found that emails with 20 lines of text had the highest click-through rates. That is roughly 200 to 250 words for the body, enough to make your point without losing the reader.
Add social proof near the CTA
Social proof builds credibility by showing that others have benefited from your offering. Include customer testimonials, case study results, or usage statistics that demonstrate value. Position social proof near your CTA to provide final validation before recipients take action. Keep testimonials brief and specific, focusing on measurable outcomes rather than generic praise.
Step 5: Write a CTA That Gets Clicked
One of the most common mistakes in email marketing is assuming your recipients know what to do after reading your email. Without a clear and specific call to action, your email campaigns are likely to fall flat.
The CTA is not an afterthought. It is the reason the email exists.
What makes a CTA work:
Clarity first. Write a subject line that is clear first and catchy second. In marketing copy, clarity should always be your priority. If, after you have drafted a clear subject line, you can also make it catchy, funny, or whimsical, then go for it.
Keep it short. Email subject lines with fewer than 70 characters have the highest open rates, which analysts attribute to their optimization for mobile device display.
Align with email content. According to Gartner, subject lines that are misaligned with email content are one of the top three reasons subscribers choose to leave an email list.
Use personalization. Personalized subject lines boost email open rates by up to 20 to 29%.
Do Not Forget the Preheader
The preheader is the short text that appears after the subject line in the inbox view. Most marketers underuse it.
Studies have shown that including a preheader can increase open rates by up to 30%. This is because preheaders provide additional information about the email content, which can entice the recipient to open the email.
On mobile devices, your email preheader text is often more prominent than the subject line. Keep it between 40 and 80 characters, and make it complement, not repeat, the subject line. Your preheader should feel like a natural continuation of your subject line, not a separate thought.
For a deeper look at what moves open rate numbers, read Email Subject Line Best Practices That Boost Open Rates by 27%.
Step 4: Write Body Copy That Keeps the Reader Moving
Once someone opens your email, your body copy has one job: keep them reading until they reach the CTA. There is no trick to this. It is about relevance, brevity, and voice.
Lead with the reader's problem or benefit
Keep the focus of your email marketing copywriting on your recipients, rather than providing too much unnecessary information about yourself and your company. People who subscribe to get your emails are more interested in how the products provided by your business can meet their needs and be helpful to them. So be more customer-centric by using the word "you" more than referring to "I," "me," "we," and "us" in your email copy.
Use a conversational tone
Marketing emails perform best when they sound like they are from a person, not a corporation. Use natural language, contractions, and a tone that matches how you would speak to your audience in person. Avoid industry jargon unless your audience expects it, and eliminate unnecessarily complex terms. Ask questions, use second-person pronouns, and maintain an authentic voice that reflects your brand personality.
Keep copy scannable
Most subscribers skim before they read. Use short paragraphs of two to three lines. Use bullets to break up lists of features or benefits. Bold key terms sparingly. The structure should guide the eye downward toward the CTA.
A study by the email marketing platform Constant Contact found that emails with 20 lines of text had the highest click-through rates. That is roughly 200 to 250 words for the body, enough to make your point without losing the reader.
Add social proof near the CTA
Social proof builds credibility by showing that others have benefited from your offering. Include customer testimonials, case study results, or usage statistics that demonstrate value. Position social proof near your CTA to provide final validation before recipients take action. Keep testimonials brief and specific, focusing on measurable outcomes rather than generic praise.
Step 5: Write a CTA That Gets Clicked
One of the most common mistakes in email marketing is assuming your recipients know what to do after reading your email. Without a clear and specific call to action, your email campaigns are likely to fall flat.
The CTA is not an afterthought. It is the reason the email exists.
What makes a CTA work:
Your email CTAs should be clear, compelling, and action-oriented. Keep your email CTA brief and straightforward, using no more than five words. Clarity is critical, your customers should instantly understand what action you want them to take.
Use button format. According to Campaign Monitor, button-based CTAs improved click-through rates by 127%.
Personalize where possible. Personalized CTAs convert 42% more than generic ones.
Align the CTA with the buyer stage. "Learn More" works better at the awareness stage, while "Buy Now" is ideal for ready-to-convert users. Aligning the CTA with the buyer journey ensures that you are not pushing too hard too soon.
Stick to one primary CTA. If needed, you can add a secondary CTA, but multiple prominent CTAs can confuse users and reduce conversions. Focus on guiding your audience toward a clear action.
Step 6: Personalize and Segment Before You Send
Generic, broadcast emails are the fastest way to lose subscribers. 90% of email marketing professionals report that using subscriber segmentation to deliver targeted messages boosts performance for marketing emails.
Segmentation does not need to be complicated to produce results. Start with:
Purchase history: What has the subscriber bought or not bought?
Engagement level: Have they opened the last five emails or gone cold?
Stage in the funnel: Are they a new lead, a trialing user, or an existing customer?
Geography or industry: Is the offer relevant to where they are or what they do?
Segmented campaigns achieve 14% higher open rates and 28% better click rates compared to generic sends. Advanced segmentation and personalization can boost revenue by up to 760%, making it one of the highest-impact optimization tactics available.
For techniques that go beyond first-name personalization, see 7 Email Personalization Techniques That Boost Conversions 47%.
Step 7: Test, Measure, and Iterate
Writing better marketing emails is an ongoing process, not a one-time project. The only way to know what works for your specific audience is to test.
Most email marketing software has built-in A/B testing tools, which make it incredibly easy to test subject lines, sender fields, CTA copy, and more. It is an effective way to practice conversion rate optimization on your campaigns.
Test one variable at a time. If you change the subject line and the CTA simultaneously, you will not know which change drove the result.
The metrics that matter most:
Your email CTAs should be clear, compelling, and action-oriented. Keep your email CTA brief and straightforward, using no more than five words. Clarity is critical, your customers should instantly understand what action you want them to take.
Use button format. According to Campaign Monitor, button-based CTAs improved click-through rates by 127%.
Personalize where possible. Personalized CTAs convert 42% more than generic ones.
Align the CTA with the buyer stage. "Learn More" works better at the awareness stage, while "Buy Now" is ideal for ready-to-convert users. Aligning the CTA with the buyer journey ensures that you are not pushing too hard too soon.
Stick to one primary CTA. If needed, you can add a secondary CTA, but multiple prominent CTAs can confuse users and reduce conversions. Focus on guiding your audience toward a clear action.
Step 6: Personalize and Segment Before You Send
Generic, broadcast emails are the fastest way to lose subscribers. 90% of email marketing professionals report that using subscriber segmentation to deliver targeted messages boosts performance for marketing emails.
Segmentation does not need to be complicated to produce results. Start with:
Purchase history: What has the subscriber bought or not bought?
Engagement level: Have they opened the last five emails or gone cold?
Stage in the funnel: Are they a new lead, a trialing user, or an existing customer?
Geography or industry: Is the offer relevant to where they are or what they do?
Segmented campaigns achieve 14% higher open rates and 28% better click rates compared to generic sends. Advanced segmentation and personalization can boost revenue by up to 760%, making it one of the highest-impact optimization tactics available.
For techniques that go beyond first-name personalization, see 7 Email Personalization Techniques That Boost Conversions 47%.
Step 7: Test, Measure, and Iterate
Writing better marketing emails is an ongoing process, not a one-time project. The only way to know what works for your specific audience is to test.
Most email marketing software has built-in A/B testing tools, which make it incredibly easy to test subject lines, sender fields, CTA copy, and more. It is an effective way to practice conversion rate optimization on your campaigns.
Test one variable at a time. If you change the subject line and the CTA simultaneously, you will not know which change drove the result.
The metrics that matter most:
Open rate: Signals subject line and sender reputation performance.
Click-through rate (CTR): Reveals whether the body copy and CTA are working.
Conversion rate: Measures whether the email actually drove the desired action.
Unsubscribe rate: A rising unsubscribe rate usually signals content irrelevance or sending frequency issues.
The real measure of performance is what happens next. Clicks, conversions, replies, and revenue are all better metrics of success than open rates alone.
Open rate: Signals subject line and sender reputation performance.
Click-through rate (CTR): Reveals whether the body copy and CTA are working.
Conversion rate: Measures whether the email actually drove the desired action.
Unsubscribe rate: A rising unsubscribe rate usually signals content irrelevance or sending frequency issues.
The real measure of performance is what happens next. Clicks, conversions, replies, and revenue are all better metrics of success than open rates alone.
The subject line is under 70 characters and specific
The preheader adds new context and is under 80 characters
The body copy leads with the reader's benefit
The tone is conversational, not corporate
There is one primary CTA in button format
The list is segmented appropriately for this message
The email has been tested on mobile
The email has one clear goal
The subject line is under 70 characters and specific
The preheader adds new context and is under 80 characters
The body copy leads with the reader's benefit
The tone is conversational, not corporate
There is one primary CTA in button format
The list is segmented appropriately for this message
The email has been tested on mobile
Frequently Asked Questions
How long should a marketing email be?
Research by Constant Contact found that emails with 20 lines of text had the highest click-through rates. In practical terms, that is roughly 200 to 250 words of body copy. The right length depends on the goal: a transactional email or promotional announcement can be shorter, while a nurture email building a case for a purchase may need more space. Always cut any sentence that does not move the reader toward the CTA.
How many CTAs should a marketing email have?
One primary CTA per email. Using multiple CTAs can be overwhelming and reduce the effectiveness of each one. Instead, use a single, prominent CTA that stands out and clearly communicates the desired action. If you have secondary links, such as a blog post or social follow, keep them visually subordinate so they do not compete with the main action.
What is the best way to personalize marketing emails?
Start with segmentation based on behavior and lifecycle stage, then layer in content-level personalization. Automated emails triggered by user behavior account for 46.9% of email sales while comprising only 2.6% of sends. That ratio shows the power of behavioral relevance. Beyond the first name, use purchase history, browsing activity, and engagement data to send the right message to the right person at the right time.
How do you write a subject line that improves open rates?
Write it to be clear about what is inside the email, keep it under 70 characters, and personalize it where you have relevant data. Your subject line should be concise, engaging, and highly relevant to the rest of your email. Avoid all caps, excessive punctuation, and spam trigger words. Then test two variations against each other and use the winner as your new baseline.
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Frequently Asked Questions
How long should a marketing email be?
Research by Constant Contact found that emails with 20 lines of text had the highest click-through rates. In practical terms, that is roughly 200 to 250 words of body copy. The right length depends on the goal: a transactional email or promotional announcement can be shorter, while a nurture email building a case for a purchase may need more space. Always cut any sentence that does not move the reader toward the CTA.
How many CTAs should a marketing email have?
One primary CTA per email. Using multiple CTAs can be overwhelming and reduce the effectiveness of each one. Instead, use a single, prominent CTA that stands out and clearly communicates the desired action. If you have secondary links, such as a blog post or social follow, keep them visually subordinate so they do not compete with the main action.
What is the best way to personalize marketing emails?
Start with segmentation based on behavior and lifecycle stage, then layer in content-level personalization. Automated emails triggered by user behavior account for 46.9% of email sales while comprising only 2.6% of sends. That ratio shows the power of behavioral relevance. Beyond the first name, use purchase history, browsing activity, and engagement data to send the right message to the right person at the right time.
How do you write a subject line that improves open rates?
Write it to be clear about what is inside the email, keep it under 70 characters, and personalize it where you have relevant data. Your subject line should be concise, engaging, and highly relevant to the rest of your email. Avoid all caps, excessive punctuation, and spam trigger words. Then test two variations against each other and use the winner as your new baseline.
