Thunderbird Saved Mail Permissions

[John M. Moniz]

I use Thunderbird for e-mail on my little home network and have it set 
up to retrieve POP3 mail from sympatico. I use the Global setting and 
have the Thunderbird Server Settings such that each profile on any PC 
will retrieve the e-mail and store it to the same Inbox on a file 
server, giving all profiles full access to the mail on any PC. All saved 
mail folders are likewise accessible to any user on any PC. All saved 
folders have the owner & group set to one profile and permissions are 
set to be accessible by all users (all on the same group).

I run into situations, when a user makes changes to the saved folders, 
where the ownership and permissions change to something other that what 
I have set. I don't know all of the occasions when this happens, but it 
always happens when a user compacts a folder. The user doing the 
compaction becomes the owner of the folder and the permissions change to 
'read only' for all other users in the group. This can be annoying when 
it happens to the Inbox.

I'd like to fix this without changing the whole system to IMAP (which I 
intend to do *some day*). Is there a way to fix the ownership 
permissions so that it doesn't get changed by other users?

I thought I had found a solution in a book by setting the User ID and 
Group ID permission bits, but the changes still occur. As a home user, I 
don't get involved much in permissions other than rwx, so am at a loss.

Any help would be thankfully appreciated.

John.
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