Bcc email-addresses should never be in bcc mime headers

[joust1]

BCC should not be included in mime headers. Doing so causes all recipients to receive the full list of email addresses (even if their email client does not show them, they can be seen in the raw message).

BCCs are already added via RCPT TO

Further info: https://cknotes.com/bcc-email-addresses-should-never-be-in-bcc-mime-headers/

//Fix: remove/comment out lines 354 to 356 as below
// if (!empty($this->bcc)) {
// $this->setHeader('Bcc', $this->formatAddressList($this->bcc));
//}