Ensuring readability in your emails is crucial. Use simple language and avoid jargon that might confuse your audience. Keep your sentences and paragraphs short, and utilize whitespace to make your email more visually appealing. Tools like the Flesch-Kincaid readability test can help you assess whether your content is easy to read. Additionally, consider using a responsive design to ensure that your email looks good on all devices, as this can affect how your content is perceived.