Edatis is an email router and online marketing specialist. The company publishes a study about subject of emails in email marketing.
The choice of subject of an email is often sloppy. Where design seems paramount, choosing the subject line often comes last in the email marketing creation chain. However, it is the main gateway to your subscribers. An email campaign with a wrong subject may not work, even if the rest of the campaign is properly designed.
This study reviews the best practices in this area and tries to explain what makes a good email subject.
To illustrate a study, there is nothing like a good graph. Here is a graph that shows the impact of the length of the subject of an email on the opening rate of it:
![Email open rate according to subjectline length](https://www.badsender.com/wp-content/uploads/2010/07/ScreenShot105.jpg)
You can download this study by filling out this form.