MailManagerInterface

class \Drupal\Core\Mail\MailManager extends \Drupal\Core\Plugin\DefaultPluginManager implements \Drupal\Core\Mail\MailManagerInterface uses \Drupal\Core\Messenger\MessengerTrait, \Drupal\Core\StringTranslation\StringTranslationTrait
class \Drupal\Tests\Core\Mail\TestMailManager extends \Drupal\Core\Mail\MailManager

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