Utilizing the Nylas APIs and its Java SDK, developers can send emails and attachments directly from Java applications, ensuring emails land in recipients' inboxes rather than spam folders. The process involves setting up a Java project with Maven in an IDE like IntelliJ, modifying the pom.xml to include necessary dependencies such as the Nylas Java SDK, and creating a main class for drafting and sending emails. Environment variables such as ACCESS_TOKEN are managed through a .env file for API authentication. The guide also covers building an email complaint form using the Spark micro-framework, which involves setting up a feedback web form that sends user input as an email. The tutorial emphasizes the simplicity and effectiveness of integrating email functionalities into Java applications while providing resources like GitHub repositories and documentation for further learning.