What font and image format are accepted in Rule?

A good thing to keep in mind is that not all email clients support all types of fonts. When working in our classic campaign editor, a "fallback" or "web-safe font" is always displayed.

In our new editor and in a preview/live email, you can see the selected font as long as the email client supports it.

Fonts

You can add fonts from a selection of standard fonts or upload your own via Brand Style.
It’s important to know that support for non-web-safe fonts is limited. Only common web fonts such as Times New Roman, Arial, and Verdana are fully supported in text.
You can read more about what counts as web-safe fonts here.
When using custom fonts such as Google Fonts, it’s important to keep in mind that not all email clients support all fonts. If an email client does not support a particular font, a web-safe standard font will be applied.
When ordering a template for our classic editor, you will need to provide the font you want to be used in the template and specify which standard font should be displayed if your custom font cannot be shown.

Image Formats and Sizes

The image formats supported in Rule are JPG, PNG, GIF, and WEBP.

Maximum image height is 2000 pixels. Larger images will be adjusted to fit within this limit.
For the image to be responsive/high-resolution on a retina screen, it should be saved at double the intended size.
Example: If an image should be 200 px wide in the newsletter, it should be saved (or cropped) to 400 px wide.
The maximum file size is 10 MB. The smaller the image file, the faster the email can load.
It's worth mentioning that by double-clicking on the image block, you can access Image Properties, where you can insert a URL for an animated image file that is larger than 10 MB. Since the email "streams" the image from an external URL instead of embedding it directly, there is no size limit in this case.