Automatically inline all the CSS in an HTML email (using the grunt-inline-css plugin by jgallen23)

Gruntfile.js

module.exports = function(grunt) {

  grunt.initConfig({
    inlinecss: {
        main: {
            options: {
              removeStyleTags: false,
              preserveImportant: true,
              preserveMediaQueries: true,
              webResources: {
                images: false
              }
            },
            files: {
                'dist/email-1.html': 'email-1.html',
                'dist/email-2.html': 'email-2.html',
                'dist/email-3.html': 'email-3.html',
                'dist/email-4.html': 'email-4.html',
                'dist/email-5.html': 'email-5.html',
                'dist/email-6.html': 'email-6.html',
                'dist/email-7.html': 'email-7.html',
                'dist/email-8.html': 'email-8.html'
            }
        }
    }

  });
  grunt.loadNpmTasks('grunt-inline-css');

  grunt.registerTask('default', ['inlinecss']);
};