All classes that implement MailInterface in Drupal 10

class \Drupal\Core\Mail\Plugin\Mail\PhpMail implements MailInterface
class \Drupal\Core\Mail\Plugin\Mail\TestMailCollector implements MailInterface
class \Drupal\mail_html_test\Plugin\Mail\TestHtmlMailCollector
class \Drupal\system_mail_failure_test\Plugin\Mail\TestPhpMailFailure implements MailInterface

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