From Meh to Wow: 50 Standout Testimonial Email Subject Lines

Testimonial email subject lines can be a powerful tool for convincing potential customers to take action.

By highlighting positive experiences from satisfied customers, these subject lines can help build trust and credibility for your business.

In this blog post, we'll explore some best practices for crafting compelling testimonial email subject lines that will encourage your subscribers to open and engage with your emails.

Whether you're looking to promote a new product, drive sales, or simply strengthen your brand, effective testimonial subject lines can make all the difference.

What is a Testimonial?

A testimonial is a statement or review from a customer that provides feedback on a product or service.

Testimonials can be written or recorded, and they typically highlight the benefits and positive aspects of a business or offering.

They are often used by companies as a way to build trust and credibility with potential customers, as they provide third-party validation of the quality and value of the product or service being offered.

Testimonials can be especially effective when they come from satisfied customers who have had a good experience with the product or service, as they can provide a sense of authenticity and reliability.

Benefits of Testimonials for Email Marketing

Testimonials can be an effective element of an email marketing strategy for several reasons.

Increased Credibility: Testimonials from satisfied customers can help to build trust and credibility with potential customers.

Seeing that other people have had positive experiences with your product or service can help to convince them to try it out for themselves.

Personalization: Including testimonials in your emails can help to make the marketing message feel more personalized and relevant to the recipient.

It can also help to create a sense of social proof, as the recipient may feel that if other people are happy with the product or service, it must be good.

Increased Conversions: Testimonials can be a powerful tool for increasing conversions, as they can help to persuade potential customers to take the next step and make a purchase.

By highlighting the benefits and results that other customers have experienced, you can help to convince the recipient that your product or service is worth trying.

Social Proof: Testimonials can provide social proof, which is the idea that people are more likely to take action if they see that others are doing it too.

By including testimonials in your emails, you can show potential customers that other people are using and enjoying your product or service, which can help to increase their confidence in it.

Increased Engagement: Including testimonials in your emails can help to increase engagement, as recipients may be more likely to read and interact with the email if they see that it includes real-life stories and experiences.

This can help to build a connection with the recipient and make them feel more invested in your product or service.

If you are curious about the ways to ask for testimonials, go ahead and see How to Ask for Testimonials for Your Business? 6 Quick Tips and come back for top 50 testimonial email subject line examples.

Top 50 Testimonial Email Subject Line Examples

The list of testimonial email subject lines is very long so we are sure that you’ll find the one that sparks your interest!

1. "Thank you for your business!"
2. "We appreciate your kind words"
3. "Your feedback means the world to us"
4. "Your satisfaction is our top priority"
5. "Glad to see you had a great experience"
6. "See what sets us apart through the eyes of our customers"
7. "Our customers speak - see why they choose us"
8. "The proof is in the testimonials"
9. "Customers can't stop raving about us🤟"
10. "Experience the power of our product through the words of our satisfied customers"
11. "Get inspired by what our customers have to say"
12. "See the impact our product has made on real people"
13. "Find out why our customers keep coming back👀"
14. "Hear from the people who have experienced the benefits firsthand"
15. "Customers share their success stories"
16. "Read what our customers have to say about us"
17. "Find out why our customers are so loyal"
18. "See the real results our customers have achieved"
19. "Testimonials from happy customers"
20. "We appreciate your feedback"
21. "Thanks for sharing your thoughts with us"
22. "Your testimonial means everything to us"
23. "We're grateful for your support"
24. "Thank you for your business"
25. "We value your satisfaction and appreciate your feedback"

26. "See what sets us apart through the eyes of our satisfied customers"
27. "Find out why our customers keep coming back"
28. "Read the success stories of our satisfied customers"
29. "Get inspired by the experiences of our customers"
30. "Discover the reasons why our customers love us❤️"
31. "See the real results that our customers have achieved"
32. "Find out what sets us apart, according to our loyal customers"
33. "Hear from the people who have experienced the power of our product firsthand"
34. "Find out why our customers are so loyal"
35. "Get inspired by the testimonials of our satisfied customers"
36. "Read the real stories from real customers📝"
37. "Discover the benefits that have kept our customers coming back"
38. "Find out what sets us apart, according to our customers"
39. "Read the success stories of our happy customers"
40. "Experience the power of our product through the eyes of our satisfied customers"
41. "See what sets us apart, according to our loyal customers"
42. "Find out why our customers love us💕"
43. "Get inspired by the experiences of our satisfied customers"
44. "Read the real stories from real people"
45. "Find out what sets us apart, according to the people who matter most - our customers"
46. "See the real results that our customers have achieved"
47. "Find out why our customers are so loyal✨"
48. "Discover the benefits that have kept our customers coming back"
49. "Hear from the people who have experienced the power of our product firsthand"
50. "Get inspired by the testimonials of our satisfied customers💫"

7 Testimonial Email Best Practices

But having the perfect subject line doesn’t create the magic on its own. Inside the email should also be as attractive as its outside. So let’s see the best practices of creating a testimonial email!

1. Personalize the Email

Make the email feel more personal and authentic by using the customer's name and referencing their specific experience with your product or service.

You can also consider including details about their occupation or location to add a personal touch.

2. Use Images and Graphics

Testimonial emails can be more engaging when they include images or graphics that help to illustrate the points being made.

Consider including pictures of the customer using your product, or graphics that highlight key points or quotes from their testimonial. Be sure to use high-quality images that are relevant and visually appealing.

3. Use Quotes

Pull out key points or phrases from the customer's testimonial and use them as quotes in the email. This can help to make the email more engaging and memorable.

Consider highlighting the quotes in a visually appealing way, such as using a different font or color to draw attention to them.

4. Use Numbers

Using numbers or lists in the subject line can be a good way to highlight specific benefits or features of the product or service.

For example, "5 ways our product has helped [customer] streamline their business" or "7 impressive results our customer achieved with our product".

5. Utilize Emojis

Emojis can make fun email subject lines and catch the eye way to add personality to your subject line, but it's important to use them sparingly and make sure they are relevant to the content of the email.

Overusing emojis or using them in a way that doesn't make sense for the email can come across as spammy and decrease the chances that recipients will open the email.

6. Include a Call to Action

Testimonial emails are a great opportunity to encourage your subscribers to take action.

Consider including a clear and compelling call to action, such as signing up for a trial or purchasing a product.

Make sure the call to action is easy to find and understand, and consider using buttons or other visual elements to make it stand out.

7. Test and Optimize

As with any email marketing campaign, it's important to test and optimize your testimonial emails to ensure that they are effective.

Consider A/B testing different subject lines, formatting, and calls to action to see what works best for your audience.

Track key metrics, such as open and click-through rates, to see how your emails are performing and make adjustments as needed.

Before You Leave…

Crafting the perfect testimonial email subject line is a crucial step in ensuring that your email is opened and read by your audience.

By highlighting the benefits of your product or service and using language that evokes emotion, you can create a subject line that will grab the attention of your readers and encourage them to take action.

However, it's important to also keep in mind that the subject line should be relevant, clear, and concise, as well as comply with any email marketing best practices.

By following these tips, you can create a compelling testimonial email subject line that will help you connect with your audience and drive conversions.

What’s your secret to get testimonials?

Meet me in the comments below!

Frequently Asked Questions

1. What is the Best Length for a Testimonial Email Subject Line?

Subject lines should be concise and to the point, ideally no more than 50 characters.

This allows the subject line to be fully visible on most devices and makes it more likely that recipients will open the email.

2. How can I Make my Testimonial Email Subject Line Stand Out in a Crowded Inbox?

Using specific, descriptive language and including a benefit or CTA can make your subject line more compelling and increase the chances that it will stand out in a crowded inbox.

Avoid using vague or generic language, as this can make it less likely that the email will be opened.

3. Can I Use a Question in my Testimonial Email Subject Line?

Asking a question in the subject line can be a good way to engage recipients and encourage them to open the email to find out the answer.

For example, "Want to see how our product has transformed [customer]'s business? Check out their testimonial inside!"

Check These Out!

• 100+ Email Subject Lines to Request Reviews from Customers
• Impressive Social Proof Statistics You Should Know in 2022
• 12 Best Social Proof Tools That Will Better Your Business
• Catchy Email Subject Lines & 19 Proven Tips to Lead You

Frequently Asked Questions

What is a catchy subject line for an email?

A catchy subject line for an email is one that’s specific, benefit-focused, and instantly tells the reader why opening the message is worth their time—ideally in 4–8 words and written in a natural, human tone. The best subject lines combine clarity (what the email is about) with a compelling hook (what’s in it for them), such as a result, curiosity, urgency, or social proof. For example, “See what customers are saying about us” works well for testimonial-driven emails, while “Quick question about your recent order” feels personal and low-pressure; you can also boost opens by adding light personalization (“[First Name], a quick favor?”) or a concrete promise (“How teams cut onboarding time by 30%”). Avoid vague phrases (“Important update”) and spam triggers (“FREE!!!”), and make sure the subject line matches the email content so readers don’t feel misled.

What is the subject line for a review email?

A strong subject line for a review request email is clear, friendly, and makes the action feel quick and easy, while referencing the product or experience so the recipient immediately knows what you’re asking about. High-performing options often include a time cue (“2 minutes”), a gentle ask (“quick favor”), personalization (“[First Name]”), or the product name to jog memory, such as “Take 2 minutes to review your [Product Name]” or “How was your experience with [Product Name], [First Name]?” If you want a slightly more engaging angle, you can use appreciation or impact: “Thanks for choosing us—could you leave a quick review?” or “Your feedback helps others choose—can you share yours?” Keep it short, avoid sounding demanding, and align the tone with your brand; the goal is to reduce friction and make the request feel simple, respectful, and timely.

How to write a testimonial email?

To write a testimonial email, start by deciding the story you want the testimonial to tell (the problem before, what they used, and the result after), then make it easy for the customer to respond by asking a few specific, guided questions instead of a broad “Can you write a testimonial?” Keep the email short and conversational, personalize it with the customer’s name and the product/service they used, and explain why you’re asking (e.g., it helps other customers feel confident) while reassuring them it will only take a minute. Include prompts like: “What challenge were you facing before?” “What made you choose us?” “What results have you seen (numbers if possible)?” and “What would you tell someone considering us?” Offer a simple reply option (they can just hit “Reply” and answer in a few sentences) and, if appropriate, provide a draft they can edit or approve to reduce effort. Finally, ask permission to use their words and identify how you’ll attribute it (name, company, photo), and consider adding an optional request for a headshot or logo to increase credibility in future emails and landing pages.

What is a good subject line for an email to a professor?

A good subject line for an email to a professor is direct, specific, and professional, clearly stating the course and the purpose so it’s easy to find and prioritize in a busy inbox. The most effective format typically includes the course code/name plus the request or topic, such as “BIO 201: Question About Lab Report Requirements,” “ENG 110: Project Submission – Final Draft,” or “HIST 305: Request for Office Hours Appointment.” If you’re following up, add a clear marker like “Follow-up:” or “Reminder:” and keep it polite, for example, “Follow-up: Recommendation Letter Timeline (PSY 101).” Avoid vague subject lines like “Hello” or “Important,” and don’t overuse urgency; clarity and context are what make your email stand out and get answered faster.

What is Professional testimonial email subject lines?

Professional testimonial email subject lines are polished, specific, and credibility-driven, designed to highlight customer results and build trust without sounding hypey or overly promotional. They often reference outcomes, industries, or recognizable proof points (ratings, customer names with permission, case-study language), such as “Customer Story: How [Company] Achieved [Result],” “Real Results from Teams Like Yours,” “What Our Customers Say About [Product],” or “Rated 4.8/5 by Customers—Here’s Why.” For internal or B2B audiences, a more formal tone works well: “Client Testimonial: [Service] Impact Summary” or “Case Study Highlights: [Outcome] in [Timeframe].” The key is to keep the promise grounded and verifiable, use personalization where appropriate, and match the subject line to the email’s content (a short quote, a mini case study, or a link to a full testimonial page) so the reader immediately sees authentic, relevant social proof.