I found that if I type ftp.mydomain.com in a web browser I can see the 2 directories "mail" and "pub". Although It's impossible to write to this directories, and I have disabled any anonymous features, I don't like this behaviour, in addition it do not let my browser ask for login and password, so I'm unable to login as someone@ftp.sromano.com (where "someone" stay for "something@mydomain.com", and no browsers are accepting an address with wo "@"!!).
How can I change this??