Email parsing has become an essential task for extracting information from emails efficiently, and by using Ruby and ChatGPT, developers can create an application that parses emails seamlessly. Before ChatGPT, methods like Regular Expressions were utilized, but they required manual adjustments for different email structures. The blog discusses building a simple application using the Nylas Ruby SDK, Sinatra, and OpenAI's ChatGPT to display and parse the first five emails in a mailbox. Users can select an email to view its parsed information, which is processed through a ChatGPT prompt that converts email content into JSON format. The project involves setting up a Ruby environment, creating necessary files, and configuring API keys, with the application running on a local server. This combination of Ruby, Nylas, and ChatGPT simplifies the previously challenging task of email parsing, allowing for more dynamic and adaptable solutions.