87+ Testimonials Email Subject Lines (That Work!)

Updated: May 15th, 2021

If you're looking to boost your email open rates and increase sales, your email subject line is the first (and most important) step in achieving those goals.

Did you know that 33% of email recipients open emails because of an engaging subject line?

That's why it's critical to craft a catchy email subject line that will get you the traffic and conversions you deserve.

We've put together a list of 87+ testimonials email subject lines (that work!).

Some are proven examples from other successful campaigns, and some are creative ideas to inspire you.

Creative Email Subject Line Ideas

  • [Customer Name], thank you…
  • This link is expiring
  • Join us.
  • Don’t wait extra. Up to 60 percent off on new arrivals.
  • Customers cannot get enough things
  • Good news inside only for you.
  • Are you looking for this?
  • 2 days left! Get up to 99 percent off on reviewing us
  • You deserve a little extra.
  • A quick way to think you from ( name of the company)
  • Hi Heena, time is running out.
  • [Advertisement] Your video will begin shortly: 0:11
  • Dear John, please provide your testimonial
  • Don’t just believe but express your emotions
  • Get it before it is gone
  • Don’t review us
  • You know us. What do you think?
  • Only 10 seats left. Will you get yours?
  • Why we are India’s No 1 print news source?
  • Please tell your experience. Free 365 days shipping
  • See top travel destinations
  • 6 promotional products perfect for your next review
  • Free bag of treats
  • It’s time to get your reviews on our product or service
  • Meet with us and write your experience shopping with us.
  • Hey Sheela, you are going to love these new features.
  • Here’s what Nashville’s CEOs said about us
  • It’s crazy how much love we’ve gotten!
  • Limited edition: Please provide your feedback.
  • Absolute must have in your wardrobe
  • What is in this mail that you must write about
  • Did you like [product name]?
  • We don’t want to stress you out but we want your opinion
  • Last chance to get up to 50 percent off.
  • This link is expiring. Please review us
  • The fashionable clothes that everyone wants
  • We are waiting for your valuable feedback
  • Please don’t say goodbye
  • 10 things you should know about indirect mails
  • Is this is the product that you have been waiting for?
  • We need you…
  • Seema Mahajan, What is your favorite Pizza?
  • Thanks for your purchase. How was our service?
  • Its high time to get personal, Reeta
  • Follow this link to record your feedback
  • [Customer Name], did we earn your trust?
  • USA Today has a few kind words
  • Too busy to read this email.
  • You have to see what in this mail
  • Party is almost over but we are waiting for you
  • Hmmm….What is this?
  • Did you know?
  • Get inspiration for your holidays. Review us
  • Totally impressed
  • We are offering 3 month subscription absolutely free.
  • Saturday is the last day to review us.
  • Break these 5 rules of testimonials.
  • Code inside. You made the cut for 50 percent off on everything
  • Your opinion is timeless but the sale is not.
  • Really great. We are waiting for your feedback
  • You just killed it!
  • More athletes prefer our brand
  • We want to see something special
  • The reaction to our new product has been…
  • Last chance to save big.
  • No subject. It is just an email response
  • Jen wore it, grab it before anyone else does!
  • Are you still deciding?
  • Today is the last day
  • Only we need your testimonial
  • Hey, only 4 hours left
  • Only 9 tickets left for you
  • Weekend is almost over but free shipping only for you
  • Click on this link to record a video
  • Gifts for everyone in your list
  • Here is why Indians choose to drink Coca Cola
  • Your favorite product is all around
  • [Customer Name], do you agree?
  • Would you like to have a free spa day?
  • Your dream vacation rental could gone tomorrow
  • What do you think about us?
  • Long Monday? Check out this to help you express your views
  • Don’t miss out this opportunity to provide your feedback.
  • 5 festivals to inspire your next trip
  • You win by not providing your feedback
  • RSVP: will you be coming to this open house?
  • Choose or lose. Please fill our form

GUIDE: How To Write A Great Subject Line

As we mentioned above, crafting a catchy subject line is critical to the performance of your email campaign.

While just a few words may seem like a small piece of your overall message, this is the first impression your audience will have before they decide whether to open your email.

If your subject line isn't engaging or appealing enough, there's a chance it could get buried in your reader's inbox.

Let's go over the proven tips on how to craft a subject line that boosts engagement:

What makes a great subject line?

First, let's discuss the fundamentals of creating a great subject line:

  • Spark interest and curiosity
  • A clear and urgent call to action
  • An offer/intriguing discount
  • Personalization (this can be done by sending out different versions of emails to subscribers based on their preferences)
  • Relevance - make sure your subject line covers the current trends and topics within your industry

5 Tips To Crafting a Great Subject Line

Now, let's dive into the specifics of how to create a great subject line for your next campaign:

1. Use a familiar sender name

Although this may seem obvious, it's a piece many marketers miss the ball on.

Your readers want to feel like your email is coming from a human and not a corporation or automated system.

One of the easiest and most effective ways to do this is by changing the sender's name to YOUR name or someone in the company that is well known.

Here's a great example of this from Marketing Examples


Pro Tip

Avoid the "no-reply" sender name at all costs. This makes your email feel unfamiliar, unapproachable, and less personable.

2. Keep your subject short and to the point

If your subject line is too long, it will get cut off, which could impact your reader's chances of opening your email.

The rule of thumb (for both mobile and desktop) is to keep your subject line under 50 characters.

3. Add personal touches to your subject line

If you have access to information about your subscriber (ie. name, location, etc), you can use this to benefit your subject line and catch your readers attention.

It's important not to go overboard here, but adding even the simplest touch such as their name can build trust and rapport.

Here's a great example of a personalized email + offer I received from BarkBox with my dog's name in the subject line:


4. Avoid making any false promises

Your subject line makes a commitment to your reader, so it's important you don't stretch the truth just to simply get more opens and clicks.

In the grand scheme of things, making false promises will end up hurting your open rate as your readers will lose trust in you.

5. Give them a sneak peek of what's inside

Telling your subscriber what is inside helps with open and clicks.

For example, if you're providing your reader with a free guide or e-book, consider making your subject line something along the lines of:

"Your FREE marketing e-book awaits!"


If you want your email campaign to perform well, it all starts with your subject line.

Think about the emails you receive in your inbox and what makes you click vs what gets buried - odds are, the same habits go for your customer.

We hope you enjoyed our guide + list of 87+ testimonials email subject lines (that work!).

meet the author
Pat Walls

I'm Pat Walls and I created Starter Story - a website dedicated to helping people start businesses. We interview entrepreneurs from around the world about how they started and grew their businesses.