PHPMailer::preSend(): bool

1634    public function preSend()1635    {1636        if (1637            'smtp' === $this->Mailer1638            || ('mail' === $this->Mailer && (\PHP_VERSION_ID >= 80000 || stripos(PHP_OS, 'WIN') === 0))1639        ) {1640            //SMTP mandates RFC-compliant line endings1641            //and it's also used with mail() on Windows1642            static::setLE(self::CRLF);1643        } else {1644            //Maintain backward compatibility with legacy Linux command line mailers1645            static::setLE(PHP_EOL);1646        }1647        //Check for buggy PHP versions that add a header with an incorrect line break1648        if (1649            'mail' === $this->Mailer1650            && ((\PHP_VERSION_ID >= 70000 && \PHP_VERSION_ID < 70017)1651                || (\PHP_VERSION_ID >= 70100 && \PHP_VERSION_ID < 70103))1652            && ini_get('mail.add_x_header') === '1'1653            && stripos(PHP_OS, 'WIN') === 01654        ) {1655            trigger_error(self::lang('buggy_php'), E_USER_WARNING);1656        }1657 1658        try {1659            $this->error_count = 0; //Reset errors1660            $this->mailHeader = '';1661 1662            //The code below tries to support full use of Unicode,1663            //while remaining compatible with legacy SMTP servers to1664            //the greatest degree possible: If the message uses1665            //Unicode in the local parts of any addresses, it is sent1666            //using SMTPUTF8. If not, it it sent using1667            //punycode-encoded domains and plain SMTP.1668            if (1669                static::CHARSET_UTF8 === strtolower($this->CharSet) &&1670                ($this->anyAddressHasUnicodeLocalPart($this->RecipientsQueue) ||1671                 $this->anyAddressHasUnicodeLocalPart(array_keys($this->all_recipients)) ||1672                 $this->anyAddressHasUnicodeLocalPart($this->ReplyToQueue) ||1673                 $this->addressHasUnicodeLocalPart($this->From))1674            ) {1675                $this->UseSMTPUTF8 = true;1676            }1677            //Dequeue recipient and Reply-To addresses with IDN1678            foreach (array_merge($this->RecipientsQueue, $this->ReplyToQueue) as $params) {1679                if (!$this->UseSMTPUTF8) {1680                    $params[1] = $this->punyencodeAddress($params[1]);1681                }1682                call_user_func_array([$this, 'addAnAddress'], $params);1683            }1684            if (count($this->to) + count($this->cc) + count($this->bcc) < 1) {1685                throw new Exception(self::lang('provide_address'), self::STOP_CRITICAL);1686            }1687 1688            //Validate From, Sender, and ConfirmReadingTo addresses1689            foreach (['From', 'Sender', 'ConfirmReadingTo'] as $address_kind) {1690                if ($this->{$address_kind} === null) {1691                    $this->{$address_kind} = '';1692                    continue;1693                }1694                $this->{$address_kind} = trim($this->{$address_kind});1695                if (empty($this->{$address_kind})) {1696                    continue;1697                }1698                $this->{$address_kind} = $this->punyencodeAddress($this->{$address_kind});1699                if (!static::validateAddress($this->{$address_kind})) {1700                    $error_message = sprintf(1701                        '%s (%s): %s',1702                        self::lang('invalid_address'),1703                        $address_kind,1704                        $this->{$address_kind}1705                    );1706                    $this->setError($error_message);1707                    $this->edebug($error_message);1708                    if ($this->exceptions) {1709                        throw new Exception($error_message);1710                    }1711 1712                    return false;1713                }