Sorry for posting this here if it's not the right place: but I've tried sending email from within the DMXZone email screens provided (and I am logged in). Every time I click the Send-Email, the response is a "400 Bad Request". I tried this from three different browsers (Chrome, IE9, Firefox) and get similar results.

I will have a look at it, thanks for reporting the problem

Seems the email does work and was send, but the redirect after the email was send was false. I have fixed the redirect so it doesn't show an error anymore and you will go back to the profile page of the user.