Warning of e-mail duplication when archiving?

A

Al

Is there a way of detecting whether there is an exact duplication of an
e-mail in an archive folder? I wish to consolidate the filing of my e-mails:
if I simply copy all mails from folder A into folder B, then how do I avoid
getting duplicates if the same e-mail is already in both folders? (I'm
looking for something similar to the Windows notice received when moving a
file into a folder.)
 
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