Drupal 8 Module Development

The mail plugin

So let's start by creating our Mail plugin class, and if you remember, plugins go inside the Plugin folder of our module namespace. Mail plugins belong inside a Mail folder. So this is what a simple skeleton mail plugin class can look like:

namespace Drupal\hello_world\Plugin\Mail;use Drupal\Core\Mail\MailFormatHelper;use Drupal\Core\Mail\MailInterface;use Drupal\Core\Plugin\ContainerFactoryPluginInterface;use Symfony\Component\DependencyInjection\ContainerInterface;/** * Defines the Hello World mail backend. * * @Mail( *   id = "hello_world_mail", *   label = @Translation("Hello World mailer"), *   description = @Translation("Sends an email using an external API specific to our Hello World module.") * ) */class HelloWorldMail implements ...