Implementing code highlighting in emails can be a bit tricky due to the varying levels of HTML and CSS support across different email clients. Here are a few steps to ensure effective code highlighting:
Use Preformatted Text: Wrap your code snippets in <pre> and <code> tags to maintain formatting. Inline CSS: Since many email clients strip out external CSS, use inline CSS to style your code. For example, <code style="color: #d73a49;">. Highlight.js or Prism: Consider using libraries like Highlight.js or Prism to automatically apply syntax highlighting before embedding the code into your email.