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Non-Deliverable Email Filter (also known as NDE) is an admin feature of Nash OS and allows you (site admin) mark any email address that your emails fail to get to as non-deliverable emails. This feature is to make sure your sent emails do not consume your servers limit on number of emails per hour or par day for no apparent reason as they dont go through to non-deliverable emails in the first place. Also you can use this feature to avoid sending emails to your test users to minimize the number of useless email addresses that your server has to send to.