For emails to be directly indexed, they must be made available on the web in a format that search engines can crawl. This typically involves creating a web version of your email, often called a "web-view" version, and then ensuring that this version is publicly accessible and optimized for search engines. Here are some steps to achieve this:
Create a web version of your email content and host it on your domain. Ensure the web version is SEO-optimized with relevant keywords, meta tags, and descriptions. Submit the web version URL to search engines for indexing.