How to set lmtp delivery file/directory permissions?

[Kurt Fitzner]

I have my postfix/dovecot virtual mail system essentially (otherwise)
configured where Postfix is calling Dovecot for its virtual transport:
virtual_transport = lmtp:unix:private/dovecot-lmtp 

But I can't for the life of me see how to change the file permissions
dovecot uses to create maildir folders and files.  I looked at the
maildir [1], lmtp [2], and other documents and they are either silent on
permissions or seem to reference a shared mail permissions document [3]
that claims file and folder permissions are inherited.  I want all files
dovecot creates to be made accessible to the mail group.  Please tell me
this wasn't hard-coded a la postfix. 

Thanks, 

     Kurt Fitzner 

  

Links:
------
[1]
https://wiki.dovecot.org/MailboxFormat/Maildir#Maildir_and_filesystems
[2] https://doc.dovecot.org/configuration_manual/protocols/lmtp_server/
[3] https://doc.dovecot.org/admin_manual/filesystem_permission/
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