Originally posted by Serge
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For example, in gmail imap, gmail's "labels" are mapped to imap folders. The problem is, you can have more than one label on the same email. If you use normal imap, this means you get one independent copy of each email for every label you put on it. So an email with 3 labels would be seen by imap as 3 different emails. However, gmail's imap has an extension that gives each email a unique identifier. Using this, you can tell which emails are duplicates, only download the email one time, then display it in the proper folders.
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