PHPMailer::mailPassthru( string $to, string $subject, string $body, string $header, string|null $params ): bool

864    private function mailPassthru($to, $subject, $body, $header, $params)865    {866        //Check overloading of mail function to avoid double-encoding867        if ((int)ini_get('mbstring.func_overload') & 1) { // phpcs:ignore PHPCompatibility.IniDirectives.RemovedIniDirectives.mbstring_func_overloadDeprecated868            $subject = $this->secureHeader($subject);869        } else {870            $subject = $this->encodeHeader($this->secureHeader($subject));871        }872        //Calling mail() with null params breaks873        $this->edebug('Sending with mail()');874        $this->edebug('Sendmail path: ' . ini_get('sendmail_path'));875        $this->edebug("Envelope sender: {$this->Sender}");876        $this->edebug("To: {$to}");877        $this->edebug("Subject: {$subject}");878        $this->edebug("Headers: {$header}");879        if (!$this->UseSendmailOptions || null === $params) {880            $result = @mail($to, $subject, $body, $header);881        } else {882            $this->edebug("Additional params: {$params}");883            $result = @mail($to, $subject, $body, $header, $params);884        }885        $this->edebug('Result: ' . ($result ? 'true' : 'false'));886        return $result;887    }