Final answer:
The software that blocks emails from unknown senders is called spam filter or email filtering software. It is crucial for online security and is often included with major email services. Personal email is not entirely private, and users should employ security measures like two-factor authentication and strong passwords.
Step-by-step explanation:
The type of software designed to block emails from unknown people or businesses is known as spam filter or email filtering software. This software scrutinizes incoming emails and prevents messages from unrecognized senders from reaching your inbox. It is a vital tool for personal and professional email users in maintaining organization and enhancing online security. Major email service providers usually include built-in spam filtering capabilities.
While you might think of an email to a friend as private, once the email is sent, it can be shared broadly, indicating that total privacy in emails can often be illusory. For improved security, individuals are advised to use measures such as two-factor authentication, deploy stronger passwords, and seek education to avoid being scammed. Companies and governments, on the other hand, need to implement stronger protections on their websites to safeguard data and privacy.