Dotenv.java

@SpringBootApplication
public class GenMailApplication {

    public static void main(String[] args) {

        // configuring environment variables
        Dotenv dotenv = Dotenv.configure().ignoreIfMissing().load();

        dotenv.entries().forEach(entry ->
                System.setProperty(entry.getKey(), entry.getValue())
        );

        SpringApplication.run(GenMailApplication.class, args);

    }

}