Emailing KPI: 8 Figures to Follow to Measure the Performance of Your Campaigns in 2025

[sourovk291]

Emailing is more than ever the preferred communication channel for creating initial contact with targets and establishing a genuine, close customer relationship over time.

In fact, many companies and independent entrepreneurs use it on a daily basis. Perhaps you are one of them…

And for good reason, the benefits are more than obvious: generating new leads belgium telegram phone number list eveloping interest and curiosity for your company/brand, creating a bond with your subscribers and customers, and stimulating your sales .

But if emailing is so popular – both by the companies that use it and by the recipients who wish to receive messages through this channel, it is no less complex. Yes, emailing is a complex science… Let’s not mince our words!

Regardless of the objectives you set for yourself at the start, be sure to carefully select the emailing indicators to follow in order to analyze the emailing performance of your campaign.

Because, no matter how sure you are of your move, when you press the "send" button, you are never 100% certain that your campaign will be a success.

You will indeed have to rely on certain reliable figures and statistics (metrics) to measure your results and define whether or not your emailing is effective, and if, at least, you are making progress.

Now discover 8 KPIs to take into account to measure the performance of your email campaigns in 2025 .

Table of Contents
What is a mailing KPI?
Which emailing KPIs / newsletter KPIs should you analyze to evaluate the performance of your campaigns?
The opening rate: are your emails being opened?
How to calculate the open rate?
How do I increase my open rate?
Email click rate: are your targets clicking on your links?
How to calculate click-through rate?
How do I increase my click-through rate?
Bounce rate: Are your emails reaching your targets’ inboxes?
How to calculate bounce rate?
How do I lower my bounce rate?
Now regarding the hard bounce rate, there are two methods that can help you lower it:
– Use double opt-in to automatically remove misspelled email addresses;
– Clean your databases regularly.
The response rate: are your emails engaging?
How to calculate the reactivity rate?
How can I increase my responsiveness rate?
Conversion rate: are your campaigns generating leads?
How to calculate conversion rate?
How can I increase my conversion rate?
Unsubscribe Rate: Are Your Subscribers Unsubscribing?
How to calculate the unsubscribe rate?
How can I reduce my unsubscribe rate?
Spam complaint rate: are you ending up in your recipients’ junk mail?

How to calculate spam complaint rate?
How do I lower my spam complaint rate?
Traffic to your website: are you getting more visitors?
What is a mailing KPI?
A KPI (Key Performance Indicator) is a factor that should be analyzed in order to determine the performance and effectiveness of an email or SMS campaign.

A KPI in communication will allow you to focus on the campaign objectives, measure its performance, identify potential problems and take effective measures to improve performance. Thanks to these measurement indicators, you have concrete data in your hands that help you make decisions and managers can better understand the company's performance and make more informed decisions to achieve strategic objectives.

In the case of an email campaign, we will focus on specific KPIs. Here are 8 email KPIs to discover.



KPI emailing



Which emailing KPIs / newsletter KPIs should you analyze to evaluate the performance of your campaigns?


The opening rate: are your emails being opened?


How to calculate the open rate?


The open rate is one of the most well-known KPIs. It is calculated using the following formula: Open rate = Number of email opens / number of emails sent *100

The opening rate is an indicator that lets you know if your emails are opened by your targets . Do you have a low opening rate?

There are two possible reasons for this low rate:

Your subject line is unattractive, it doesn't make you want to read the email;
You have arrived in your recipients' spam folder.


How do I increase my open rate?


To increase your opening rate, it's very simple!

Take care with your subject lines. A good email subject allows you to encourage your recipients to open your email. To do this, you can use A/B Testing, a very effective technique since it allows you to know, on two versions of emails tested, which subject triggers the most openings.

Also, in general, take inspiration from good practices to design good emails .