PHP-Debug doesnt show anything.. (Some people do receive the mail but I don't get the page which tells me that the e-mail has been send. It just goes back to the page where you can set-up the mail
Mark, did you try to send your mails to a smaller group?
Yes I did, When I select Webmasters and Moderators then it works fine! But if I select Registered Users, It tries ( I Guess) To send the mail but It returns to the EMAIL USERS page..