Option for remove duplicates

Not a few messages filtered into my spam folder by mistake. So I have to see the list of spam. Most of these messages are the same. I would like to have in settings the option for automatic deletion of duplicates in the spam folder.
Of the 1000 messages in my spam folder, there are a few got there by mistake (not spam). However, the unique spam, just 100 messages, the rest were duplicates.