system.inc.php

		$app->ispcmail->setSubject($subject);
		$app->ispcmail->setMailText($text);

		if($filepath != '') {
			if(!file_exists($filepath)) $app->error("Mail attachement does not exist ".$filepath);
			$app->ispcmail->readAttachFile($filepath);
		}

		if($cc != '') $app->ispcmail->setHeader('Cc', $cc);
		if($bcc != '') $app->ispcmail->setHeader('Bcc', $bcc);

		$app->ispcmail->send($to);
		$app->ispcmail->finish();
		
		return true;
	}
	
	public function is_allowed_user($username, $check_id = true, $restrict_names = false) {
		global $app;
		
		$name_blacklist = array('root','ispconfig','vmail','getmail');
		if(in_array($username,$name_blacklist)) return false;
		
		if(preg_match('/^[a-zA-Z0-9\.\-_]{1,32}$/', $username) == false) return false;
		
		if($check_id && intval($this->getuid($username)) < $this->min_uid) return false;
		
		if($restrict_names == true && preg_match('/^web\d+$/', $username) == false) return false;
		
		return true;
	}
	
	public function is_allowed_group($groupname, $check_id = true, $restrict_names = false) {
		global $app;
		
		$name_blacklist = array('root','ispconfig','vmail','getmail');
		if(in_array($groupname,$name_blacklist)) return false;
		
		if(preg_match('/^[a-zA-Z0-9\.\-_]{1,32}$/', $groupname) == false) return false;
		
		if($check_id && intval($this->getgid($groupname)) < $this->min_gid) return false;
		
		if($restrict_names == true && preg_match('/^client\d+$/', $groupname) == false) return false;
		
		return true;
	}

	public function tempdir($parent_path = null, $prefix = 'tmp_', $mode = 0700) {
		if(is_null($parent_path)) {
			$parent_path = sys_get_temp_dir();
		}

		$parent_path = rtrim($parent_path, '/');
		if(!is_dir($parent_path) || !is_writable($parent_path)) {
			return false;
		}

		if(strpbrk($prefix, '\\/:*?"<>|') !== false) {
			return false;
		}

		$path = false;
		$tries = 0;
		while($tries < 1000) {
			$tries++;
			$path = $parent_path . FS_DIV . uniqid($prefix, true);
			if(mkdir($path, $mode)) {
				break;
			}
		}

		return $path;
	}
	
}