umask Message Store option specifies the file mode creation mask (in octal) for many files created by Messaging Server, including the MTA as well as the Message Store. By default, store file access by other users or users in the same group is forbidden by file permissions. Setting
umask to '027' will allow users in the same primary group as the Messaging Server user to read subsequently created message store files. A more restrictive '037' setting may be appropriate for log file access. See also the
filemode logfile option.
The default value is: 077