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Best Cold Email Subject Lines for Sales (Customizable)

Learn how to write Best Cold Email Subject Lines with examples! Email Marketing | Email Subject Lines | Email Subject Lines Examples | Sales Email

Write Best Cold Email Subject Lines

People want to read less. The average human attention span is 8.25 seconds. The attention span of a Facebook post is about 2 sec. According to a study, the ideal length of a Facebook post is around 50 characters.

Best Email Subject Lines -- like blog post titles, tweets, and meta descriptions -- only take up a short space. That is why it demands professional writing skills; it also calls for a keen grasp of your target audience and the ability to condense a broader message into a few words that will resonate with them.

To train your brain to write more concisely, we recommend going through the following exercises that will help you hone your writing skills:

  1. Remove all pronouns, prepositions, adverbs, and adjectives.
  2. Remove weak words.
  3. Replace words with a single phrase.
  4. Instead of writing out numbers in words, use numerals.

Below, we’ll look at how it looks after conveying the same message on a tweet, in the meta description, and finally, in an email's subject line, without losing the purpose.

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Cold emailing is an essential aspect of sales, but it can be challenging to grab the attention of potential customers. One of the key factors in increasing the chances of your email being opened is having an effective subject line. With the vast amount of emails that people receive on a daily basis, it's crucial to make your subject line stand out from the crowd. In this article, we'll be discussing the best cold email subject line examples and how to create one that will help you avoid spam folders and increase open and click rates.

Why do you want to write the Best Email Subject Lines?

The first and foremost reason to craft a good subject line is to avoid ending up in the recipient's spam folder. A spam folder is where emails go when the email provider's algorithm thinks they're unsolicited or unwanted. To prevent this from happening, it's important to ensure that your subject line is relevant and informative. Additionally, your email's open rate, click-through rate, and CTA conversions all depend on the effectiveness of your subject line.

Best Practices of a Good Email Subject Line

Now that we've discussed why a good subject line is crucial, let's dive into the best practices for crafting one. Firstly, keeping it brief and to the point is essential. A lengthy subject line can appear spammy and be overwhelming to the reader. Personalizing the subject line by addressing the recipient by name is also a great way to increase the chances of your email being opened. Making it interesting and offering value, creating a sense of urgency, and avoiding clickbait are other important aspects to consider. Including relevant keywords, keeping the brand's consistency, and teasing something can also make a difference. Using numbers and avoiding weak words will help you appear confident, and A/B testing your subject line will allow you to adjust and improve upon it. Let's figure out each:

  1. Avoid generic spam words: To avoid your email landing in the spam folder, steer clear of trigger words such as "FREE" or "URGENT" in your subject line. Do some research on how spam filters work to increase your chances of reaching your recipient's inbox.
  2. Keep it brief: In a world of overflowing inboxes, keep your subject line short and to the point. The ideal length is around 41 characters, but make sure that each word appears on desktop, mobile, and tablet devices.
  3. Personalize it: Personalizing your subject line with your recipient's name or using your personal email address can make your message seem more human and increase your chances of a response. Research shows that personalization can boost revenue by up to 20%.
  4. Make it interesting: Grab your prospect's attention by including an interesting angle in your subject line. This could be a recent news story or statistic about their industry, a question about a recent project they worked on, or even an ask for their help.
  5. Offer value: Highlighting how your product or service can benefit your recipient or offering a promotion can increase your chances of a response. Make sure your subject line clearly conveys the value you are offering.
  6. Create urgency: Including a time-sensitive promotion or offer can create a sense of urgency and encourage your recipient to act. However, be cautious not to overuse this tactic and risk annoying your prospect with constant urgent requests.
  7. Avoid clickbait: Make sure your email subject line accurately represents the content of your email. Don't use words or phrases that imply urgency or importance where there isn't any, as this can turn off prospects and even lead to your domain being marked as spam.
  8. Include keywords: Use specific keywords in your subject line that your prospects are likely to use when filtering and organizing their inbox. Experiment with different words and phrases to see which ones work best.
  9. Tease something: Your subject line should be intriguing and suggest that there is something of value to be gained by opening the email. Use teasers to pique the curiosity of your prospects and encourage them to open your message.
  10. Avoid weak words: Use strong, assertive language in your subject line to convey confidence and authority. Don't use words like might, or could, or make promises that are too bold or salesy, but instead focus on providing value and benefits to your prospects.
  11. Keep the brand's consistency: Make sure your subject line reflects the personality and tone of your brand. Don't be afraid to show off what makes your brand unique and stand out from the competition.
  12. Keep it easy: Make your copy simple and easy to understand. Use clear and concise language in your subject line to avoid ambiguity and confusion.
  13. Use numerals: Including numbers, statistics, and facts in your subject line can instantly boost your credibility and authority. Use numbers to provide objective evidence and reinforce the value of your message.
  14. A/B test and adjust: Experiment with different subject line strategies and adjust based on what works best for your audience. Don't be afraid to try new things and iterate on your approach over time.
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Now we will introduce some marketing subject lines for you that you can customize for your needs.

Promotional Subject Lines

Promotional or limited-time offer subject lines are very powerful at moving your customers to take action. Use your subject line to emphasize what your recipients stand to lose if they don't read your email. The recipient will take prompt action if they feel the offer is valuable and is for a limited time.

10 examples of Promotional Subject Lines

  1. Don't Miss Out! Get 15% off from The Honey Pot Co.
  2. 50% off EVERYTHING at Figgers Wireless! Biggest Sale of the Year!
  3. Last Chance for InstantBoss Club's "Never Again Sale."
  4. Only a Few Hours Left! All Robes 20% off at Sudara.
  5. Get an Extra 25% off and a FREE Gift from Thrive Market - Limited Time Only!
  6. Hurry! Last Day to Grab an Additional 50% Off at July.
  7. Time is Running Out! Shirts for $39 at Charles Tyrwhitt.
  8. Labor Day Weekend Sale Alert! Up to 80% off at BaubleBar.
  9. Flash Sale Alert! Join Boston Business Women for just $16 a month.
  10. Save 35% off the Figgers Smart TV - Don't Wait!

Curious Subject Lines

In the world of email marketing, action often equates to better engagement rates. A great way to encourage action is through the use of curious subject lines. These subject lines pique the reader's interest and make them curious about what's inside the email. Curiosity keeps our mind engaged to work out the implications, explains psychologist Gary Klein. And to work out the implications, recipients need to click through to gather more information about what’s inside.

10 examples of Curious Subject Line

  1. Hubspot: "We're breaking up."
  2. Grammarly: "Is your writing as effective as you think?"
  3. FabFitFun: "You're missing out on some serious perks."
  4. Charity: Water: "This is what keeps me up at night."
  5. Glossier: "So, we did a thing."
  6. Sephora: "Don't open this email."
  7. Think with Google: "The five-ingredient recipe for YouTube success."
  8. Harry's: "Oops, we did it again."
  9. The Hustle: "We messed up."
  10. Casper: "A bed frame so perfect it deserves its own email."

Funny Subject Lines

In a sea of mundane subject lines, using humor can be a great way to grab your recipients' attention and make your email stand out. However, it's important to know your audience and make sure that the humor is appropriate and won't offend or alienate anyone. A well-executed funny subject line can appeal to your recipients' emotions and make your email more memorable.

10 examples of Funny Subject Lines

  1. Funny or Die: "Revised policy regarding jean shorts at work"
  2. Dollar Shave Club: "Open up and say wowie zowie!"
  3. Rakuten: "Peep Triple Cash Back deals before they’re gone!"
  4. Brooks Brothers: "Up to 40% off trousers & sport coats. It’s a tailor-made sale."
  5. Dollar Shave Club: "What to Do When You’re the Sweaty, Smelly Guy at the Gym"
  6. The Bouqs Company: "Pow-pop-boom-crackfsss" (Note: This was for a 4th of July sale.)
  7. Groupon: "Hey… Were You Gonna Delete This?"
  8. Rakuten: "Will you accept this Double Cash Back?"
  9. Warby Parker: "Stop the presses: We’ve got new frames"
  10. Grammarly: "Let’s eat Grandma! Let’s eat, Grandma! Punctuation saves lives."

Pain Point Subject Lines

In today's world, businesses and individuals are constantly looking for new ways to do more, explore more, and earn more. Your opportunity is to spot the roadblocks in their way and utilize those insights to position your products or services as their solution. People want to feel like their problems are recognized and solved, and there is no better place to give them that assurance than right in their email.

10 examples of Pain Point Subject Lines

  1. Dropbox: "Say Goodbye to Lost Files and Wasted Time"
  2. Fitbit: "The One Thing Standing Between You and Your Fitness Goals"
  3. HubSpot: "Are You Tired of Wasting Time on Sales Leads That Go Nowhere?"
  4. Grammarly: "Don't Let Embarrassing Typos Hold You Back"
  5. Blue Apron: "Cooking for One? We've Got You Covered"
  6. Hootsuite: "Struggling to Manage Your Social Media? We Can Help"
  7. Warby Parker: "Get Perfectly Fitting Glasses Without Leaving Your House"
  8. Evernote: "Unleash Your Creativity with the Perfect Note-Taking Tool"
  9. HelloFresh: "Sick of Eating the Same Boring Meals? Try Something New Tonight"
  10. Adobe: "Don't Let Bad Design Hold You Back - Create Stunning Graphics in Minutes"

Reengagement Subject Lines

Reengagement Subject Lines are a powerful tool to re-engage subscribers who have gone inactive or stopped opening your emails. The key to crafting effective reengagement subject lines is to create a sense of urgency or FOMO (fear of missing out) that encourages the recipient to take action. Here are 10 examples to inspire you.

10 examples of Reengagement Subject Lines

  1. "We Miss You! Can We Tempt You Back with a Special Offer?" - This subject line highlights the recipient's absence and offers an incentive to return.
  2. "Are You Still There?" - A simple, straightforward subject line that creates a sense of urgency.
  3. "Don't Miss Out on Our Latest Offers" - This subject line uses FOMO to encourage the recipient to engage.
  4. "It's Been a While, Let's Catch Up!" - This subject line plays on the idea of reconnecting with an old friend.
  5. "We've Got Something You'll Want to See" - This subject line creates curiosity and entices the recipient to open the email.
  6. "We Noticed You Haven't Been Opening Our Emails" - A straightforward subject line that acknowledges the recipient's inactivity and invites them back.
  7. "Last Chance to Save X%" - This subject line creates urgency and encourages the recipient to take advantage of a limited-time offer.
  8. "We've Got a Surprise for You!" - This subject line creates excitement and anticipation for what's inside the email.
  9. "Your Account Is About to Expire" - A subject line that creates a sense of urgency and encourages the recipient to take action.
  10. "We're Cleaning House - Stay or Go?" - This subject line creates a sense of urgency and invites the recipient to make a decision about their subscription.

Social Proof Subject Lines

Social Proof Subject Lines are a powerful way to build trust with your email recipients and persuade them to take action. By showcasing social proof, such as customer reviews, testimonials, and case studies, you can demonstrate the value of your product or service and establish credibility in the eyes of your audience.

10 examples of effective Social Proof Subject Lines

  1. "See what our satisfied customers are saying about us"
  2. "Join the thousands who have already benefited from our product"
  3. "Don't just take our word for it, hear from our happy customers"
  4. "Find out why industry experts are raving about our product"
  5. "We helped [customer name] achieve [result], and we can do the same for you"
  6. "Discover why [influencer name] recommends our product"
  7. "Our customer success stories will inspire you"
  8. "Over [number] happy customers can't be wrong"
  9. "Our product has been featured in [publication name], [publication name], and [publication name]"
  10. "Read our 5-star customer reviews and see why we're the best"

Remember, Social Proof Subject Lines are only effective if they are genuine and relevant to your audience. Make sure to use social proof that accurately represents your brand and aligns with the needs and interests of your target market.

Personalized Subject Lines

Personalized Subject Lines can make your emails stand out in a crowded inbox and increase your open rates. By using your recipient's name or other relevant information, you can create a sense of familiarity and connection. Studies show that personalized emails have higher click-through rates and generate more revenue than generic ones.

10 examples of Personalized Subject Lines

  1. Hi [Recipient's Name], we have an exclusive offer for you!
  2. [Recipient's Name], this one's just for you: 20% off your next purchase
  3. Happy Birthday, [Recipient's Name]! Enjoy this special discount on us
  4. [Recipient's Name], we think you'll love these new arrivals
  5. [Recipient's Name], did you forget something in your cart?
  6. [Recipient's Name], we've got a surprise for you inside!
  7. [Recipient's Name], we miss you! Come back for 10% off
  8. [Recipient's Name], congratulations on your recent purchase! Here's a bonus offer
  9. [Recipient's Name], we noticed you love [Product/Category]. Check out these similar items
  10. [Recipient's Name], your opinion matters to us. Take this quick survey and get rewarded.

Welcome Subject Lines

Welcome emails are a crucial component of your email marketing strategy. Not only do they confirm a new subscriber's or customer's action, but they also provide an excellent opportunity to make a good first impression and set the tone for your future interactions. To make your welcome email more effective, try using personalized subject lines that make the recipient feel valued and excited to engage with your brand.

10 examples of personalized welcome subject lines

  1. Warby Parker: "Welcome to the family, [name]!"
  2. Spotify: "Welcome to the club, [name]! Let's get started."
  3. Harry's: "Welcome to the shave club, [name]!"
  4. Airbnb: "Welcome to Airbnb, [name]! Discover a world of travel possibilities."
  5. Birchbox: "Welcome to Birchbox, [name]! Get ready to try something new."
  6. Uber: "Welcome to Uber, [name]! Your ride is on the way."
  7. Casper: "Welcome to the dream life, [name]! Get ready for a good night's sleep."
  8. Blue Apron: "Welcome to the family, [name]! Let's start cooking."
  9. HubSpot: "Welcome to HubSpot, [name]! Let's grow your business together."
  10. Amazon: "Welcome to Amazon, [name]! Start shopping and save with Prime."

Sales Subject Lines

Sales Subject Lines can be a powerful tool to increase your email open rates and drive conversions. Crafting effective sales subject lines requires an understanding of your target audience and where they are in the sales funnel.

10 examples of sales subject lines for different stages of the sales funnel

  1. Awareness Stage: "Solving your [problem] has never been easier"
  2. Awareness Stage: "Discover the secret to [desired outcome]"
  3. Interest Stage: "You won't believe what we have in store for you"
  4. Interest Stage: "Limited time offer: [discount or promotion]"
  5. Consideration Stage: "Why our [product/service] is the right choice for you"
  6. Consideration Stage: "See why [industry leader] recommends us"
  7. Decision Stage: "Join [number of satisfied customers] who chose us"
  8. Decision Stage: "Last chance to take advantage of our offer"
  9. Retention Stage: "Here's how to get more out of your [product/service]"
  10. Retention Stage: "Don't miss out on our loyalty rewards program"

Remember, the key to effective sales subject lines is personalization and relevance to the recipient. Use language that resonates with your target audience and highlights the benefits of your product or service. With the right sales subject line, you can increase open rates and drive conversions at every stage of the sales funnel.

Reminder or Follow up email subject line

Reminder or follow-up emails can be useful in various situations, such as when you need to get a response from someone, schedule a meeting, or follow up on a previous conversation. A well-crafted subject line can increase the likelihood of getting a response and keep the conversation going. 

10 examples of reminder or follow-up email subject lines

  1. "Following up on our meeting last week"
  2. "Friendly reminder: Your appointment is tomorrow"
  3. "Just checking in: Did you have any questions?"
  4. "Don't miss out on this limited-time offer"
  5. "Your free trial is expiring soon"
  6. "Just a quick reminder about the proposal"
  7. "Last chance to register for our event"
  8. "Let's schedule that call we talked about"
  9. "Are you still interested in our services?"
  10. "Gentle reminder: Your payment is due soon"

Remember to keep your subject lines concise, specific, and actionable. Let the recipient know why you are following up and what you need from them. Also, avoid using aggressive or pushy language and always be respectful of the recipient's time.

Emoji Subject Lines

Emojis are a fun and creative way to add personality to your subject lines and catch the attention of your subscribers. They can help your emails stand out in a crowded inbox and even increase your open rates. However, it's important to use them thoughtfully and appropriately, as overusing or misusing them can have the opposite effect.

10 examples of effective emoji subject lines

  1. 🎁 Last chance to save on holiday gifts!
  2. 🍂 Fall into savings with our autumn sale!
  3. 🎉 Celebrate our anniversary with 20% off!
  4. 🚨 Don't miss out on our flash sale!
  5. 🌟 You're a star - here's a discount code!
  6. 🍕 Satisfy your cravings with free pizza!
  7. 🎵 Get your groove on with our music deal!
  8. 💻 Upgrade your tech game with our sale!
  9. 🧘 Find your zen with our yoga classes!
  10. 🌸 Spring into savings with our new arrivals!

Remember to choose emojis that fit your brand and message, and avoid using too many or inappropriate ones. Also, make sure your subject line is still clear and concise even with the addition of emojis. Happy emoji-ing!


In conclusion, a good subject line can make or break the success of your cold email campaign. By following the best practices discussed in this article, you can create an effective subject line that grabs the reader's attention, avoids spam folders, and increases the chances of your email being opened and acted upon. Remember to keep it brief, personalized, interesting, valuable, urgent, and consistent with your brand. Use numbers, relevant keywords, and A/B test your subject line to improve your open and click-through rates over time.






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Best Cold Email Subject Lines for Sales (Customizable)
Learn how to write Best Cold Email Subject Lines with examples! Email Marketing | Email Subject Lines | Email Subject Lines Examples | Sales Email
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