Forum

I am a student enrolled in a course and in its news forum.
I receive all msgs posted in the news forum.
In the meanwhile the course administrator (the teacher) kick me off the course because of some reasons.
Now that I am out of the course (I am not enrolled any more, I am not in the course list of users I was enrolled in) I go back to the msg I received from the news forum and I use the link "reply". I can send the email, the email reaches the forum and... I self enroll myself again to the same course!!!!!!!!!!!!!!!!!!!!!!!!
Am I wrong? Am I making errors?
(the course is not open to guests, it is not allowed the autoenrollment)