Anti-spam protection in Exchange Server 2013, like in previous versions, gives an opportunity to create a whitelist of trusted email addresses and senders domains, mail from which regardless of their contents should always be received.

The mail from the whitelist senders (individuals or entire domains) is considered safe and the end users receive it even if it falls within the filtering rules. The whitelist of senders in Exchange Server 2013 can only be managed from Powershell command prompt (Exchange Management Shell).