Improver access to protected user account mail messages via spotlight

Question

What happens:
Using spotlight from USER1 finds "private" email messages in USER2. Clicking on the message opens it in a mail window, giving USER1 access to mail in folders that is has no access to. Searching for something benign like "a" provides access to all of USER2's mail. Extenuating circumstances below.
State verification:
1. Using "show all" within spotlight makes it possible to toggle between "USER1" and "This Mac" to verify that the message is not on "USER1."
2. Macintosh HD/Users/USER2 shows the folders to have the "no access" folder icon. This is confirmed with "Get Info"
3. Within "Get Info" window for folder (USER1 active), the Privilege correctly indicates that only USER2 had Read or Write access
4. Within "Get Info" window for folder (USER2 active), the Privilege correctly indicates that only USER2 had Read or Write access
5. All is the same if USER2 is logged out.
6. Within "Terminal," access permissions verify that USER1 cannot 5.
MacBook:USER2 USER1$ ls -ltotal 0
drwx------+ 6 USER2 staff 204 Dec 19 22:29 Desktop
drwx------+ 26 USER2 staff 884 Dec 18 17:32 Documents
drwx------+ 4 USER2 staff 136 Dec 19 22:26 Downloads
drwx------+ 34 USER2 staff 1156 Dec 18 09:40 Library
drwx------+ 3 USER2 staff 102 Dec 12 16:32 Movies
drwx------+ 3 USER2 staff 102 Dec 12 16:32 Music
MacBook:USER2 USER1$ cd Library/
-bash: cd: Library/: Permission denied
drwx------+ 5 USER2 staff 170 Dec 13 12:22 Pictures
drwx---r-x+ 5 USER2 staff 170 Dec 12 16:32 Public
drwxr-xr-x+ 5 USER2 staff 170 Dec 12 16:32 Sites
Extenuating Circumstances:
As best as I can tell at this point, only mailboxes/messages that have been imported have this problem. I have done a number of spotlight searches on mail recently received: these messages are found when searched within USER2, but are not found when searched within USER1, and therefore cannot be opened.

Answer 1

Additional Information:
The message files: Macintosh_HD/User/USER2/Library/Mail/Mailboxes/FOLDERS*/*Mailboxes*.mbox/Messages/.emlx
...and some containing folders appear to have access permissions that are inconsistent with the higher level folders. In short, during the import process, these files and folders were given the wrong access permissions.
Went into terminal an manually chmod'ed them.
All now appears to be working correctly.
Since spotlight has access to the file locations directly, it can get to these files and messages even through the directory cannot be accessed through other means.
[This is either a bug in the MAIL Import function that sets the wrong access permissions, the spotlight program for allowing access to a file that has the wrong permission, but is within a directory hierarchy that should not allow access, or more likely, both]
phuss