I installed this plugin into my selfhosted wordpress 3.4.1 (all updates installed). Notification about user comments are working and the test mail triggered by the plugin options button also works. But when using the contact form as an unidentified user (anyone out there in the internet) I only get an error message "Service Temporarily Unavailable
The server is temporarily unable to service your request due to maintenance downtime or capacity problems. Please try again later."
Regardless which browser I use for this.
when trying this as an identified user, it works. What's wrong?