Amazon Seller Tips: Best Email Subject Lines for Better Open Rate

Amazon Seller Tips: Best Email Subject Lines for Better Open Rate

With the current world’s population totaling 7.5 billion, there are about 3.9 billion active email users in 2018, and the number is projected to reach 4.3 billion in 2023. This means that one out of two people would have at least one or more email accounts.

In this day and age, email is an essential tool for communication. A large number of businesses also utilize email as a marketing tool to promote their products and services. For many eCommerce businesses, they completely rely on emails to communicate with their customers. This especially rings true for Amazon sellers as email is the only method of communication with their buyers.

Being limited to contact your customers by email is inconvenient. To make matters worse, buyers don’t even bother opening your emails if you have terrible subject lines. Therefore, it is critical to write an appealing email subject line that would entice your recipients to open and read your emails. 

Here are the 6 tips to help you write an email subject line that can increase email open rate:


#1 – Keep it short and simple

Today, 61% of all emails are now opened and read on mobile devices. It is best to keep your email subject lines between 41 characters (portrait view on an iPhone) to 70 characters for Gmail to avoid your subject line being cut-off. Your email subject lines should be as short and simple as possible so that the receiver can easily scan the entire subject line. Try to exclude meaningless words or frivolous details. 

Example: Tell us how we’re doing!


#2 – Create a sense of urgency

Subject lines that create a sense of urgency and scarcity can lead to a 22% increase in email open rate. You can induce a sense of urgency by using keywords such as “Attention”. When people feel a sense of urgency or the fear of missing out, they are more likely to take immediate action like opening your emails.   

If you are selling electronics products, you can send a follow-up email with a product manual to a customer who purchases your item. You can add “Attention” to the email subject lines to increase your email open rate.

Example: Attention for {{product_name}} (PLEASE READ)


#3 – Be specific and relevant

No one really reads emails, people skim through them. Humans tend to focus on one to three keywords in a sentence to quickly identify if an email should go to the junk folder. If you don’t want your emails to end up in a buyer’s spam folder, you need to make sure your subject line contains relevant information to their Amazon orders. 

Example: Your recent purchase with {{store_name}}


#4 – Pique recipient’s curiosity or interest

An interesting email subject line grabs your recipients’ attention and piques their curiosity. However, you need to know what your target audience wants to read and refrain from providing a misleading subject title to your email.

Example: We have 1 question for you…


#5 – Include numbers or figures

Having numbers in your email subject lines is more appealing than having pure texts. Human brains are naturally drawn to digits as numbers are easier to process and read. By incorporating numbers in an email subject line, you can encourage recipients to open your emails.

Example: Day 7. What’s happened so far?


#6 – Include a question mark

Including a question mark in your email subject lines is another common technique to increase email open rate. Having a question in an email subject line can interest your recipients. This will entice the readers to answer the question by clicking your email. 

Example: How are you liking {{product_name}}?


#7 – Dump A/B testing for AI-Powered solution

Traditionally, A/B testing can be used to compare the effectiveness of multiple email campaigns, but the process of performance evaluation can be time-consuming. An Amazon feedback tool like BigCentral utilizes AI technology to generate the most optimal email subject line for all emails sent to your customers according to the historical behavioral data of your buyers. Ultimately, your buyers are enticed to open your emails.


Now that you can start exploring the best subject lines for your Amazon feedback and review request emails. Try each tip to see which gives you the best email open rate. Are you struggling to craft email content? Try these 3 Amazon review request templates for free!



This blog post was originally published in December 2016 and was updated in September 2019 due to product updates or Amazon policy changes.


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