Subject lines can make or break an email campaign, and while we wish there was one tried and true method to subject line success, stellar subject lines vary between brand, audience, and email campaign. There are, however, a few general guidelines that can set you up above the rest.  

Before we get into the 29 best email subject lines that have rocked our inbox this year, take our quick, true-false quiz below to make sure your subject line foundation is solid.

To help guide your subject line strategy and inspire your own subject line copy, look through our list of 29 email subject line examples that persuaded us to open the emails.

1. Morning Brew –  ☕️ Thank you, Beyoncé 

Morning Brew continually excels at writing relevant and short subject line copy. This 3-word, 1-emoji subject line builds enough interest by featuring music icon, Queen B. Don’t mind if I find out more.

2. LuckyBrand – Welcoming You with a Sweet Treat Inside

LuckyBrand’s welcome email goes beyond the standard greeting, enticing recipients to open the email with a special treat (aka discount code!).

3. Postmates – $15 to get over the hump 🐪

It’s ideal to put the deal first in the subject line, so that recipients see at first glance that they’ll be getting $15 toward their Wednesday order. The word “hump” and camel emoji help differentiate this promotional email, making it stand out from the others in the inbox.

4. Medium – Tick (bite) tick (bite) tick (bite)

After a weekend spent in the summer outdoors, this timely subject line made my skin crawl. Evoking that much emotion through a subject line is hard to do, and led me to opening an email all about a tick epidemic. Yikes.

5. Robinhood Snacks – A Cannabis CEO gets fired by a beer CEO

Oh, the drama! The intrigue! How could you not open this email to find out more?

6. Yelp – Denver – Pulled pork, ribs, brisket, sauce, and stretchy pants required

While this subject line is on the longer side, you know exactly what to expect when you open the email. And when opened, you aren’t disappointed with the barbecue recommendations or surprised by the stretchy pants requirement. The subject line is your window to show the recipient exactly what you’ll be sharing with them. Don’t disappoint by saying one thing in the subject line and showing another in the email.

7. REI – Wild Places. Wilder Women.

I love this simple, alliterative subject line with its call to adventure. REI (most likely) segmented their contact list to send this email to their female contacts. Even this simple amount of personalization helps engage contacts and increase your email open rate.

8. Rent the Runway – You left this behind…

This subject line may be simple, but it’s effective. Life often distracts us from our purchase plans, so effective abandoned cart emails help get our shopping addiction back on track. 

9. Duolingo – 🔥You’re on a 2 day Greek streak! Make it 3?

By focusing on my current accomplishments and what I could achieve next, Duolingo reminds me to open the app and engage with its program.

10. Efficacy Clothing Company – Vacation Mode: On

You don’t have to be a large company to have awesome subject lines. This small clothing company quickly (and simply) engages recipients at the beginning of summer with a mode we all understand. Check out this article for more summer email ideas.

11. Airbnb – Your home awaits: Romantic Apartment -near Acropolis

Here’s another unique reminder. Instead of simply saying “Don’t forget about this home,” Airbnb puts a romantic twist on the update.

12. Society6 – You’ve scored 15% off (but it won’t last)

This is a great example of creating urgency without using exclamation points or the words “today” or “now.” It’s a more subtle and effective way of engaging your recipients. 

13. Winter Park Resort – You’ll thank yourself later…

We were convinced not only to open the email, but also to take a day off work to enjoy the 16” of fresh powder. You’re right, Winter Park Resort, we did thank ourselves.

14. Winc – Jillian, enjoy your personalized recipe pairings!

You don’t always have to be subtle with your personalization. Letting your recipients know that you’re trying to give them an individualized experience with your brand is a great way to show you care. 

15. Peloton – Find This Year’s Goal

We all slip a little on our workouts in the midst of holiday madness. So to help you get back on track in the new year, Peloton doesn’t even suggest working out. Nope, they just suggest setting a new goal. It’s all about those baby steps toward engagement.

16. MacPaw – Just A Thank You Note (And A 30% Off Coupon) 🎄  

This subject line is simple, but it’s also compelling. Thanking your customers is a great way to show your appreciation, and a thank you gift to go along with it takes the appreciation to another level. 

17. Casper – Best place to catch the fireworks? In bed. 

This 4th of July email got me with its cheeky subject line. While so many other emails were recommending places to watch fireworks or grill recipes, Casper sticks to what it knows—mattresses. And while this article does focus on subject lines, let’s give the preview text a shoutout too. The preview text, “Get 10% off your mattress order,” gives recipients even more of a reason to open the email.

18. Asana – You Just Got Assigned A Task, Now What?

This direct subject line may not be the snazziest, but it sure is useful. If you’ve just started using a product, a “Now what?” type email is a great way to help onboard your customers each step of the way. 

19. Felix Gray – Still Have FSA Dollars?

Since FSA dollars are lost at the start of a new year, this timely reminder is very useful to recipients who would much rather spend those funds on a pair of Felix Gray glasses. 

20. Framebridge – Goodbyes Are Hard…

This short and (bitter)sweet subject line gets to the point in just 3 words: we’re going to say goodbye unless you decide otherwise. Re-engagement campaigns are a great email marketing strategy to win back some of your subscribers and scrub your email list of subscribers who are no longer interested.

21. Artifact Uprising – Making it for Valentine’s Day? Order by Sunday!

This subject line is a soft reminder that Valentine’s Day is just around the corner, giving you the space you need to decide what you want to get for Valentine’s Day while pointing out that limited time is remaining. For Valentine’s Day and spring campaigns ideas, check out this article.

22. Chubbies Boat Shorts – Gilligan’s Thighland

Preview text: starring none other than Julieigan in their debut. 

This subject line is silly fun. Meshing my name with Gilligan in the preview text was a great way to personalize the email and make me smile. Adding humor to your emails isn’t an effective method for every brand, but it’s worth testing to see if your recipients connect with it.

23. Thursday Boot Company – “Why I’ll Live in These Boots Till I Die.”

This emphatic statement is made even more powerful by the quotes that surround it leaving you to believe that someone actually spoke these words. It was enough to pique my curiosity, so when I opened the email I was thrilled to find a review from a customer writing this very line.

24. Headspace – Ready To Meditate?

This welcome email jumps right into the purpose of the app, and gets into actually welcoming the recipient in the body of the email. It’s a refreshing approach to the welcome email subject line. 

25. Clark from InVision – A good pizza advice

Okay, I’ll admit it—I’m a sucker for puns. But what does a pizza have to do with a design company? The subject line made me curious enough to open, and find out the relation between pizza and design, (which, by the way, has to do with learning from Domino’s designer 🍕). 

26. Strava – There’s still time to get moon dust on your shoes

In celebration of Apollo 11’s 50th anniversary, Strava sent an email appealing to its audience’s sense of adventure and drive to achieve the impossible. This subject line motivates recipients to not only open the email but also dust off their running shoes for this new challenge. #challengeaccepted  

27. The Hustle – Are meetings even necessary?

Daily newsletters need to continually keep readers on their toes to drive interest. Posing a question like the one above, makes us stop for a second to think and click-through to learn more.

28. Society6 – Quiz: What’s Your Home Decor Style?

A question and quiz can be a great way to engage your recipients. While the subject line poses the question, the body of the email provides a quiz with the answers. I not only opened the email, but also clicked through to take the quiz and find items in my decor style.

29. Postmates – Search With Emojis on Postmates 📲🍕🍔🍟🚴‍♀️😋

Emojis are used alongside text in this subject line to show the new product update. Can you try telling a story with emojis in your subject lines?


In the end, what do most of these great subject lines have in common? 

  • The emails target a specific audience. These brands don’t try to appeal to everyone because that would make their emails too general to be valuable to their subscribers. 
  • They are timely. Whether it’s 4th of July, a thank you gift for Christmas, or a welcome email when you sign up for their newsletter, these emails are sent at the right time with the right topic for that moment. 
  • The subject lines hint at the valuable content inside the email. They don’t stand out because of all caps case or 5 heart emojis, but focus instead on the content they’re sending recipients.

When writing your subject lines and emails, focus on quality and the value you’re providing your recipients. With this recipient-first mentality, you’ll be on our best subject lines list in no time! 

For more email marketing best practice tips, take a look at our A-Z of Email Marketing Guide. You’ll find everything from determining your audience to creating yearly recap emails in this comprehensive resource.

Julie Griffin
Julie is the content marketing associate at SendGrid, helping to write and edit the blog, as well as enhance SendGrid’s SEO efforts. When she isn’t at the office, you’ll find her buzzing around Denver’s coffee shops, breweries, and yoga studios.