An email that utilizes a dynamic subject line will display a configured subject line that is unique to the recipient of your email. Typically this display is based on the subscriber's attributes in the system. For example, you can define one subject line to appear for all the males in your list and another for all the females.
There are two ways to accomplish the dynamic display in our system:
1. Merge subscriber data into a Subject line. In this example, you simply insert a tag to merge the subscriber's data at the time of the email send. A common example of this is to use the %%FirstName_%% tag (seen below). Easily use the "Add Merge" button to find a field in your account.
2. Utilize our dynamic Subject line feature (seen below). This feature allows you to configure Subject line display based on data of subscribers or their category membership within your account.
Please see these additional resources for dynamic Subject lines:
How do I use dynamic Subject lines in my email?
Can I display Subject lines based on category subscription?