Module 2: Images

Dimensions for images should never be bigger than the template dimensions. Keep all images at the lowest resolution acceptable for the web. We recommend keeping image sizes below 25KB and the image format set to low resolution (72dp RGB) to decrease the time it takes to load images in the inbox. The higher the resolution, and the wider and longer the image, the bigger the size. Big images will probably be blocked by the receiving server, and they may take too long to download or render.