SMTPEnd example

if ($this->SMTPHost === '') {
            $this->setErrorMessage(lang('Email.noHostname'));

            return false;
        }

        if (! $this->SMTPConnect() || ! $this->SMTPAuthenticate()) {
            return false;
        }

        if (! $this->sendCommand('from', $this->cleanEmail($this->headers['From']))) {
            $this->SMTPEnd();

            return false;
        }

        foreach ($this->recipients as $val) {
            if (! $this->sendCommand('to', $val)) {
                $this->SMTPEnd();

                return false;
            }
        }