symlinks are clobbered

I've solved the file locking problem I wrote about by copying
/var/mail/user somewhere else and then copying it back when I'm done,
which works fine. However, I have a new problem: I have a folder of
archived mail called 'received', which is just a symlink to
received-2004-Q4. (The symlink is updated via a cron job once every
three months.)

When I open the folder 'received' and change it, when it gets written
back to disk, the symlink is clobbered and I end up with 'received'
being an actual file, not a symlink to received-2004-Q4. 

Is there some way to get Mail::Box to respect my symlink?

Thanks,

Dan

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