Hi
thanks for replying my message.
those are system folders in my home directory. example: .cshrc, .DS_Store, .gnupg,Applications,Archives,... and so on. They are apearing under Inbox, Drafts,Sent,Trash and Junk.
First, I don't want to remove them. I just don't want them to apear in my folder list in Mail.app
It is strange that Mail seems to think that they are mail folders... For example, I can open .bash_history in Mail.app.
thanks again