11 files declare their use of Headers
- AbstractMultipartPart.php in vendor/
symfony/ mime/ Part/ AbstractMultipartPart.php - AbstractPart.php in vendor/
symfony/ mime/ Part/ AbstractPart.php - DataPart.php in vendor/
symfony/ mime/ Part/ DataPart.php - DelayedEnvelope.php in vendor/
symfony/ mailer/ DelayedEnvelope.php - DraftEmail.php in vendor/
symfony/ mime/ DraftEmail.php - Message.php in vendor/
symfony/ mime/ Message.php - MessageListener.php in vendor/
symfony/ mailer/ EventListener/ MessageListener.php - MimeMessageNormalizer.php in vendor/
symfony/ serializer/ Normalizer/ MimeMessageNormalizer.php - PhpMail.php in core/
lib/ Drupal/ Core/ Mail/ Plugin/ Mail/ PhpMail.php - SMimePart.php in vendor/
symfony/ mime/ Part/ SMimePart.php - TextPart.php in vendor/
symfony/ mime/ Part/ TextPart.php