This Small Plug-in collect logs about each failed login attempt of your Joomla site’s administrator and sends an email about each of those to the super administrator of the site with the username, password, ip address and error. Don’t forget to publish the plugin after installing.

Version 1.5.2
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+ Added an option to enter custom email address.
+ Added and option to select multiple user(s).
+ Collect only the administrator logs and no the frontend.

Version 1.5.3
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+ Added option to either select frontend or backend for collecting logs
+ Specefies the login originating source in the email
+ Added 1.6 Compatibility

Version 1.5.4 (Security Release)
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+ Added option to not save the password in clear text.