This add-on allows you to personalize the emails you send to your users by inserting their personal data such as their name, avatar, confirmation status, etc... Here is the related dynamic text's insertion interface:
The filter will only be available if the Community Builder component is installed.
In the first dropdown you can select the field to use to filter.
The second allow you to choose how to compare the value (equal, like, greater than, lower than...).
The third one allow you to set the value to compare to.