Auto filter duplicate emails

As a web-hosting provider, I would like to see a filter function that auto deletes duplicate emails in the incoming mailbox so that it's not a manual process.

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There's a BCC option, with that function, all incoming and outgoing emails will be send one more copy to appointed account. But, if that email included multiple recipient and the target bcc, that bcc account will have many duplicated emails.

Can cpanel add an easy filter function, which can easy enable to auto filter the duplicated emails?