[Dovecot] File and group permissions for incoming mails

Hello

I am using Dovecot 1.1.1 together with Postfix (and for some users Procmail for Spam Filtering). Until now I didn't have to use shared mailboxes.

Now I want to use simple simlinking to grant other users of the same group access to my mails. The problem is that new incoming mails have always file permissions set to 0600.

I have also a file called dovecot-shared (0660) in the Maildir folder. No success. Why doesn't this work?

I also tried to use UMASK in the procmailrc. No success.

Any help is appreciated!

Best regards Sascha