What should be done if you want to implement a Block Sender Policy?

Implementing a Block Sender Policy is aimed at preventing emails from specific senders from reaching your organization. To achieve this, it is essential to specify the sender in the Block list. This action directly tells the email filtering system to reject any incoming messages from that particular sender, thereby enhancing your organization's security posture by avoiding unwanted or potentially harmful communications.

Adding a sender to a whitelist would do the opposite of what is intended in a Block Sender Policy, as whitelisting allows trusted senders' emails to pass through without being screened. Setting a policy to allow emails from all senders contradicts the fundamental purpose of blocking, as it would permit all incoming communications. Ignoring the sender's domain would not effectively block the sender, since there would be no proactive step taken to prevent their emails. Therefore, specifying the sender in the Block list is the most appropriate and effective way to implement a Block Sender Policy.