Different schools have different practices in respect of sending acceptance letters, because this is an optional notification method. I believe at least the schools will post the printed admission results somewhere in the school.
Posting the results on the internet is not mandatory either. The government-aided school my son applied for did not post results on the internet and I had to go to the school to see if his name was on the list. All or part of his name can be concealed if the school is concerned about privacy for publishing the info on the internet.
I really hope EDB will make posting results on the school's web site mandatory, in addition to the printed ones inside the school. It does not take much effort (and hence $$$) but it will be much more convenient for parents applying for more distant schools.