PhpMail::MAILBOX_LIST_HEADERS
A list of headers that can contain multiple email addresses.
See also
\Symfony\Component\Mime\Header\Headers::HEADER_CLASS_MAP
File
- 
              core/lib/ Drupal/ Core/ Mail/ Plugin/ Mail/ PhpMail.php, line 30 
Class
Namespace
Drupal\Core\Mail\Plugin\MailCode
private const MAILBOX_LIST_HEADERS = [
  'from',
  'to',
  'reply-to',
  'cc',
  'bcc',
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