In the new mail editor, you have the option to conveniently add a divider to visually separate different sections of your email campaign. First, choose Email in the navigation bar:
Create a new campaign by clicking 'Create blank campaign'.
You'll see the email campaign on the left, and the different modules on the right side. Clicking or dragging the 'Divider' module will add a line to the email, with which you can separate parts of the email:
This will also open up the module settings for this specific module, so you can make changes to it. You can change the color of the divider, as well as the size in pixels and the type of border (solid, dashed and dotted). Additionally you can add padding on either side of the dividing line. The default setting is 20 pixels of padding on either side.
Clicking on the color opens up a color picker. Use the slider to choose a color or enter its hexadecimal value.
You'll be able to change the padding values as well, or make the border a bit thicker, or change the type of border to 'dashed'. Or do all at the same time!
Click 'Save and Close' when you're satisfied with your work. Your end result may look something like this: