PHPMailer::preSend(): bool

1542    public function preSend()1543    {1544        if (1545            'smtp' === $this->Mailer1546            || ('mail' === $this->Mailer && (\PHP_VERSION_ID >= 80000 || stripos(PHP_OS, 'WIN') === 0))1547        ) {1548            //SMTP mandates RFC-compliant line endings1549            //and it's also used with mail() on Windows1550            static::setLE(self::CRLF);1551        } else {1552            //Maintain backward compatibility with legacy Linux command line mailers1553            static::setLE(PHP_EOL);1554        }1555        //Check for buggy PHP versions that add a header with an incorrect line break1556        if (1557            'mail' === $this->Mailer1558            && ((\PHP_VERSION_ID >= 70000 && \PHP_VERSION_ID < 70017)1559                || (\PHP_VERSION_ID >= 70100 && \PHP_VERSION_ID < 70103))1560            && ini_get('mail.add_x_header') === '1'1561            && stripos(PHP_OS, 'WIN') === 01562        ) {1563            trigger_error($this->lang('buggy_php'), E_USER_WARNING);1564        }1565 1566        try {1567            $this->error_count = 0; //Reset errors1568            $this->mailHeader = '';1569 1570            //Dequeue recipient and Reply-To addresses with IDN1571            foreach (array_merge($this->RecipientsQueue, $this->ReplyToQueue) as $params) {1572                $params[1] = $this->punyencodeAddress($params[1]);1573                call_user_func_array([$this, 'addAnAddress'], $params);1574            }1575            if (count($this->to) + count($this->cc) + count($this->bcc) < 1) {1576                throw new Exception($this->lang('provide_address'), self::STOP_CRITICAL);1577            }1578 1579            //Validate From, Sender, and ConfirmReadingTo addresses1580            foreach (['From', 'Sender', 'ConfirmReadingTo'] as $address_kind) {1581                if ($this->{$address_kind} === null) {1582                    $this->{$address_kind} = '';1583                    continue;1584                }1585                $this->{$address_kind} = trim($this->{$address_kind});1586                if (empty($this->{$address_kind})) {1587                    continue;1588                }1589                $this->{$address_kind} = $this->punyencodeAddress($this->{$address_kind});1590                if (!static::validateAddress($this->{$address_kind})) {1591                    $error_message = sprintf(1592                        '%s (%s): %s',1593                        $this->lang('invalid_address'),1594                        $address_kind,1595                        $this->{$address_kind}1596                    );1597                    $this->setError($error_message);1598                    $this->edebug($error_message);1599                    if ($this->exceptions) {1600                        throw new Exception($error_message);1601                    }1602 1603                    return false;1604                }1605            }1606 1607            //Set whether the message is multipart/alternative1608            if ($this->alternativeExists()) {1609                $this->ContentType = static::CONTENT_TYPE_MULTIPART_ALTERNATIVE;1610            }1611 1612            $this->setMessageType();1613            //Refuse to send an empty message unless we are specifically allowing it1614            if (!$this->AllowEmpty && empty($this->Body)) {1615                throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);1616            }1617 1618            //Trim subject consistently1619            $this->Subject = trim($this->Subject);1620            //Create body before headers in case body makes changes to headers (e.g. altering transfer encoding)1621            $this->MIMEHeader = '';