when creating a new account, the password field is not limited like it should be
you can put in a password of 15 characters, but sympa chops off anything more than 8 but doesn't tell you! So when you try to login with your 15 character password, you cant, because its only an 8 character password.
(from redmine: created on 2008-12-11, closed on 2008-12-12)