Member Login Log …

I have set up a sight with Simple Membership plugin in which we plan to create some common user logins that will be assigned to different membership levels allowing access to premium content. I’d like to be able to run promotions in which an email sent to a group provides login credentials allowing them to access premium content for a limited time (i.e. until password is changed and/or user account is deleted).

But, I’d like to be able to see the effectiveness of the campaign by seeing how many and how often the login credentials are used to access the site.

I have experimented with some WP plugins that log user login activity such as “User Login Log” by Webalizer, but unfortunately, this only logs logins that occur through the backend of the wordpress site (i.e. mydomain/wp-admin ) and not logins via the simple membership login dialog.

So, my question is whether there is a way to log user logins occuring through simple membership plugin. Is there an addon available or a login log plugin that is compatible and able to track logins via Simple Membership Plugin?

Thanks.
-jbisko