[Dovecot] Default permissions on newly created maildir

[Alex]

 Hi Guys,

 I am setting up SQL auth for mail. Auth works fine, I notice that if no 
 maildir exists for the authenticated user, it is created automatically 
 (depending on the homedir specified in the sql table entry). The problem 
 is that it creates the dir with "700" permissions which is causing grief 
 for my MTA when it comes time for it to try and drop mail there. If I 
 chmod the dir to 770 things work fine. How do I change the default 
 permissions that dovecot uses whenever it creates a new mail account?