50+ Cold Email Subject Line Examples

There will be at least 3 billion email users by 2020 says the Radicati’s 2016 Email usage Statistics report. That’s 1 in every 3 people on this planet. Majority of people decide to read an email or mark it spam based on its subject line. This is decided by the email subject line!

Here are some points which need to be understood before using these tips for cold email subject line.

Attracting customers through emails is considered to be an awesome strategy, but the catch is that nearly 43% of the emails are deleted or marked spam as soon as they are delivered to the inbox. Surprisingly 69% of these were marked spam only based on the subject line.

For many businesses, Email is the first point of contact with their prospective customers. This means that a single email could be the difference between “Deal” and “No deal”.

Characteristics of Cold Email Subject Line-

1. Respect The Time Of Your Email Reader

Email subject line timming

In a B2B marketing scenario, almost every person will receive at least 1 email every two minutes. This implies that you need to be efficient in delivering your subject line. One way to do it is by using small (not more than seven words, small) subject lines.

It just takes 3 seconds to read a subject line compressed into seven words. This practice makes it easy to read emails on Mobile devices such as smartphones and tablets. A study found out that 35% of people read their emails on mobile devices. “Moreover, testing the deliverability rate of your email address will help you make sure that emails are 100% delivered to the recipient’s inbox.”

Cold Email Subject Line Example:

1. “Look inside for great sales tips

2. “Been there done that!”

3. “Requires your Urgent attention”

4. “Offers expiring tonight”

5. “We’ll help you get your leads”

6. “Choose a better corporate bank account”

7. “5 points to remember while presenting”

Time it well

Well, sending an e-mail on a weekend or a holiday will not make much sense. Lucrative subject lines framed to attract the customer will not work. A lesson to be learnt – be sensitive to the timing of your subject line.

For example

8. “Make your business GDPR ready” a mail that could have been sent just before GDPR rules kicked in

9. “It’s time to file taxes” a Tax law firm could use this when the financial year ends

10. “Give your employees free air miles, with our corporate credit card” a credit card company affiliate could send this just before the holiday season

11. “Give your business a boost this holiday season”

12. To increase click-through rates before the super bowl season, it is advised to use “Capitalize on Super bowl fever” as email subject line.

13. “It’s the right time to meet your targets”

2. Simplified Your Email

Simple cold email subject line

You don’t need to be Dr Shashi Tharoor while writing email subject lines! So make it as simple as possible.

Do not use complex words or sentence formation. Writing “peregrinating” instead of “travelling” will surely make you look qualified but it might earn you a place in the trash folder. This point complements the above point, “respect their time”.

Cold Email Subject Line Example:

14. “Looking for B2B leads”

15. “Tips to increase your sales”

16. “Double your sales”

17. “How to increase your sales”

18. “A better sales strategy”

19. “Marketing did right”

20. “Best Ransomware protection in the industry”

3. Personalize Your Email 

personalised cold email subject

Use the first name of your prospect, including Birthday or the name of their favourite football player. Do a bit of research before you compose the email.

Cold Email Subject Line Example:

21. “Hey Tom, I Could help you file your firm’s taxes”, A tax attorney could get some businesses to sign up for his consultancy

22. “Harry, try our lead generation tool and hit your sales target”

23. “Hello there, are you taking the right decisions on your marketing strategies?”

24. “Congratulations on being promoted. Double your achievements with our tools”

25. “Sam boost the productivity of your team using our productivity tool”

26. “John, use our CRM to manage customers better”

27. “Alex, we could help you set up your new office”

28. “Mark, get a background check done on new employees”

29. “Jacinda, get a professional-looking website for your business today”

This trick works well since it has some personal touch and demonstrates that you care for your prospect’s interests.

4. Start Your Cold Email Subject Line With a Question

a question

Asking a question in the subject line works perfectly because the average attention span of a person is just 8 seconds.

Cold Email Subject Line Example:

30. “Need customized stationery supplies for your business? A customized print shop could attract some customers by using this subject line

31.“Decrease the cost of your printing” An offset print service, can successfully use such subject lines to Get B2B customers

32. “Are your customers opening the emails you send?” An email marketing firm can use this line.

33. “How are you finding your leads?” “Looking for a custom prospect list?”

34. “Is your employee healthcare plan good enough?” can be sent by Img a corporate insurance Company.

35. ”Is your Database slow? Try our new DBMS“

5. Be Funny In Your Content

Funny cold email subject line

A humorous B2B subject line will come as a breath of fresh air, unlike all the dull, stuffy emails that we find in our inbox today.

Cold Email Subject Line Example:

36. “Enter the magic portal called Digital marketing” could be an effective yet funny line that a digital marketing company could use.

37. “Hi, spending too much on Coffee try our range of ICE teas” A funny line an Ice tea vending machine company can use.

38. “Marketers assemble”. A funny line for an upcoming Marketing Conference.

39. “Is your sales Strategy as good as the new Nolan movie”

40. “Two to tango” a mail that can be sent by workplace collaboration software company

Follow up with a fun factor

We all have seen the “you still there?” question pop up while using Netflix. It is a bland way to follow up and you would not like to send an email to your prospects.

To keep up the interest of your prospect, use a funny email subject line in the follow-up emails.

Cold Email Subject Line Example:

41. “Have we bored you enough” for an unresponsive prospect

42. “Let’s have a fresh start” to restart the conversation with an old prospect

43. “Remember me” a funny follow up the line from the famous BBC show “Sherlock”

44. “Are we on a break?” a take on famous sitcom ‘friends’ line

45. “We don’t want to lose you” a great way FBI can follow (upon) you. Haha

46. “Still here!, and happy to help” a funny twist to Netflix’s “still there” and extending a helping hand at the same time


Create a subject line which caters to the person’s Fear of Missing out.

Brands use this all-time to promote their products.

Cold Email Subject Line Example:

47. “Get 70% off this Christmas on office furniture cleaning!” A furnishing company could incorporate this line to get better click-through rates

48.“Rest in a comfortable office sofa, now at 20% cash back”. A corporate furniture supplier used this for email subject line to boost his sales.

49. “Best business class airfares for a limited time” A travel agency can write such subject lines

50. “Uh-oh, your subscription for office supplies is expiring”. This helped a stationary supplying firm to boost his business exponentially.

51. “One last chance to try our lead generation software

52. “Your free trial ends today, subscribe to keep up with the latest marketing trends.

53. “Get your news,Ad–free. Hurry! Offer ends in 2 hours

Don’ts of Cold Email Subject Line

dont of email subject

Do not compose a very long subject.

  • Do not use Jargons unnecessarily. This confuses. Moreover, the reader needs to see a dictionary
  • Do not ever add the word “Newsletter”. A study from Adestra found that emails including the word “newsletter” in the subject line saw an 18.7% decrease in open rates
  • Do not use ALL caps or a lot of Exclamation marks. A subject line that is all caps will directly end up in the spam folder.
  • Do not use unfamiliar fonts or formatting. Because some computers might not support that font making your subject lie illegible.

To Sump up-

So what are you waiting for? Use our tricks to increase email open rates, connect with customers faster and make your Email marketing even more effective. A subject line can decide your success or failure!

Do you want to generate leads at a low cost? Download our Chrome extensions and start exploring it for free.

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About Gundeep Singh

Gundeep is the Digital Marketing Manager of Aeroleads. He has experience for 4 years in SEO. He believes in targeting every problem with an out of the box solutions. When he is not working, you can find him socialising on Linkedin and other Social Platforms.

4 Thoughts on “50+ Cold Email Subject Line Examples

  1. Pingback: The Ultimate Cheat Sheet on Email Marketing - AeroLeads

  2. Tomas Medema on September 23, 2017 at 11:31 am said:

    What a great read! Just what I was looking for to upgrade even further my email subject lines!
    I could add from my side that it’s also very beneficial to have email service provider who allows you to test your headlines with A/B testing. At least that’s how I know more what kind of subject lines work for my business. I know that there are few who offer this functionality like MailChimp, AWeber, Getreponse and Campaign Monitor. While from experience I can suggest trying out Mailerlite which gives amazing functionality for very attractive price. If interested, you can find more info here: https://www.mailerlite.com/full-feature-list. But don’t just take my word for it – try it out! 🙂

  3. Good information, For cold email marketing which subject line should be used.

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