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Yep... Everyones correct, this can't be done easily, although of course it can be done, but hacking a Linux PC would be morally offensive. But on the other hand though, if it were a Windoes box I would have absolutely no problems with it! Funny that huh?
One of the main areas Linux focuses on is being secure, for good reason too!
If you can read the files with your normal user then you will be able to copy them & do what ever you like but you will not be able to remove the originals.
Because you are asking this I am assuming that you don't have root access. Is this true? If not, whats is the big deal with using the root or mail accounts to do what you want?
You could make the other user a member of the group that the files get but this could still present a security hole as the other user would have access to all files with that group not just mail.
I'm not sure why you're reluctant to do this a root in cron. Since you have to be root to modify root's cron this is "reasonably" secure. You'd just want to make sure the script root is calling is also only writable by root to prevent someone from changing what the script does. (This is similar to the risk you have with scripts called from init.d.)