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huum unfortunatly there is no way to delete inactive users after a same time.
personally i write a little php file to delete them (im too newbi in php and MySQL so sorry for basic code) btw share with you:
define("user", "database_username");
define("pass", "database_password");
define("host", "localhost"); //or change it to yours
define("db", "database_name");
$cxn = mysql_connect(host ,user, pass);
mysql_select_db(db);
$delete_time = time() - ( 5 * 24 * 60 * 60 ); // 5 days/month * 24 hrs/day
// * 60 minutes/hour * 60 seconds/min.
$sql = "DELETE from `xoops_users` WHERE `last_login` = '0' AND `user_regdate` < '$delete_time'";
//This script would delete everyuser older than 5 days that has been not active.
$result = mysql_query($sql, $cxn);
?>
just save it as a file like "inactive_delete.php" and run it.i run this file with chron job every day.
WARNNING: dont put this file in your ROOT because this is no secure at all.