All classes that implement MailInterface in Drupal 9

class \Drupal\Core\Mail\Plugin\Mail\PhpMail implements MailInterface
class \Drupal\Core\Mail\Plugin\Mail\TestMailCollector implements MailInterface
class \Drupal\amazon_ses\Plugin\Mail\AmazonSes implements MailInterface, ContainerFactoryPluginInterface uses AmazonSesHandlerTrait
class \Drupal\business_rules\Plugin\Mail\BusinessRulesMail implements MailInterface
class \Drupal\devel\Plugin\Mail\DevelMailLog implements MailInterface, ContainerFactoryPluginInterface
class \Drupal\forward\Plugin\Mail\ForwardMail
class \Drupal\forward\Plugin\Mail\ForwardMail
class \Drupal\mail_html_test\Plugin\Mail\TestHtmlMailCollector
class \Drupal\phpmailer_smtp\Plugin\Mail\PhpMailerSmtp extends \PHPMailer\PHPMailer\PHPMailer implements MailInterface, ContainerFactoryPluginInterface uses StringTranslationTrait
class \Drupal\phpmailer_smtp\Plugin\Mail\PhpMailerSmtp extends \PHPMailer\PHPMailer\PHPMailer implements MailInterface, ContainerFactoryPluginInterface uses StringTranslationTrait
class \Drupal\phpmailer_smtp\Plugin\Mail\PhpMailerSmtp extends \PHPMailer\PHPMailer\PHPMailer implements MailInterface, ContainerFactoryPluginInterface uses StringTranslationTrait
class \Drupal\simple_mail\Plugin\Mail\SimpleMail implements MailInterface
class \Drupal\simplenews\Plugin\Mail\HTMLTestingMailSystem implements MailInterface
class \Drupal\system_mail_failure_test\Plugin\Mail\TestPhpMailFailure implements MailInterface
class \Drupal\webform\Plugin\Mail\WebformPhpMail

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