Handling duplicate mails

I agree with wdfs about the problem of the way duplicates are handled. I copy everything that comes in to all my addresses, IMAP or POP, into a local archive folder. This gives me the equivalent of a journal file, which I never touch, just export from time to time. Then I file some mails from the in-box and throw away the rest. This gives me two views on my correspondence and makes it difficult to lose things by mistake.

Could the duplicates not be handled as aliases, transparent to the user?

This would be really nice.

We could add an option to treat duplicates as replicants, this would be more efficient as a duplicate in our database implies a copy of the same file.

This would be very helpful. Thanks