[Dovecot] BUG: messages created with permissions not respecting umask

[Thomas Vander Stichele]

Using dovecot 1.0rc15, together with postfix and dovecot-lda.

umask is set to 0007.  This should ensure directories and files get
created with read/write permissions for both user and group.

However, dovecot-lda writes files with 600 permissions, instead of 660.
So dovecot does not seem to respect the umask configuration property for
local mail delivery.

In my particular case, I have vmail:vmail own the mail directories, and
a backup user part of the vmail group.  However the backup user cannot
read the mails and thus back them up properly.

Suggestions:
- respect the umask for file delivery as well
- alternatively, take the parent directory's permissions, strip
executable bits, and apply to file

Thanks
Thomas