[Dovecot] Dovecot MDA creates folders for nonexisting users

[Janantha Marasinghe]

Hi,
I have setup postfix and dovecot and set dovecot as the LDA.my issue is that it 
accepts mails for non existing users and creates folders for them. Otherwise 
all mail delivery works fine. im using mysql for authentication. I do not see 
any error messages on my mail.log too.
Thnks jay