Mails optional with BCC

The CMS Questions
2

The logic muss be part of the value, you can’t just put it inside the array. This should work:

'bcc' =>  $page->mail_bcc()->isNotEmpty() ? $page->mail_bcc()->html() : null,

An alternative way to accomplish this would be to add an item conditionally to the array:

$email = [
      'from'      => $mail_from,
      'replyTo'   => $mail_reply_to,
      'to'        => $mail_to,
      'subject'   => $mail_subject,
      'body'      => $mail_text
];

if ($page->mail_bcc()->isNotEmpty()) {
     $email['bcc'] = $page->mail_bcc()->html(),
}

$kirby->email($email);

You don’t want those quotes around your variables, either.