I think I am on the point of giving up on this plugin.
The back end is the best I have seen - the way it handles the e-mails, bounces, the way e-mails are sent out in batches and tracked etc. It just rocks.
The front end, however, seems to be full of traps, mostly revolving around this dual user system - one system for WP and one for MP. Synchronisation between the two is extremely easy to break, and very hard to join back up again. A single WP user can have many e-mails registered, but can only get back to the admin screen on the first of them.
Even when I am not logged into WP, MP seems to remember one of the subscribed MP users.
The front end seems to follow a model that is neither fully integrated with WP, nor the fully separate from WP. For example - even if I am logged into WP, with full user synchronisation enabled, I can subscribe to MP using a third e-mail address, and then go through the e-mail confirmation process. This ends up with multiple MP users semi-synchronised with the WP user, and no ability to select any particular one to manage.
With the documentation being sparse, it is difficult to tell whether the module is supposed to work like this or not.
Sorry if this comes across negative, but I have spend weeks trying to understand MP, but just don't get the front end. Is it me? Quite possibly. Any tips before I give up? I really don't want to lose that wonderful back-end functionality.