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The Badmail folder contains messages that cannot be delivered into your organisation, and also cannot be returned back to the sender. Therefore, the folder typically contains spam, and the files within the folder can usually just be deleted.In Microsoft Exchange versions prior to 2003, all mail that cannot be delivered ends up in the Badmail directory. This folder grows infinitely till it runs out of disk spaceExchange 2000: The Badmail folder contains messages that cannot be delivered into your organisation, and also cannot be returned back to the sender. Therefore, the folder typically contains spam, and the files within the folder can usually just be deleted.Exchange 2003: Badmail is not kept in Exchange 2003 SP1. With SP1 and above tools, it's easy to maintain a "Badmail-free" Exchange environment, or control how big the Badmail folder gets. There are registry keys to modify the behavor of badmail in 2003.