Using this extension you can send email whenever any user logins to your Joomla website.
Login notify is a plugin that send email alert when any user log-in to the system. You can even set the application for which you want to make this plugin work like only for admin section or only for site. This plugin also allows you to set the usergroup(s) for which login notify is needed, suppose you do not want to get the alerts for super users or administrator then this is completely possible with this plugin. This plugin also facilitates you to send alert to the logged-in user.