SSL (Secure Sockets Layer) is a protocol for securing internet connections between two systems. In the context of email, SSL provides encryption for TCP/IP connections between a client and a server, ensuring that all communication between the two is encrypted. SSL is important for email security for two main reasons:

• Confidentiality: Checking email without using SSL means that anyone with a device on the same network can eavesdrop on your communications. They can use commonly available tools, such as Wireshark, to read your email as it transits the network.

• Account Security: If you dont encrypt your connection to the mail server, it will send your username and password in cleartext on the network. An eavesdropper would then be able to log in to your mail account and send/receive email using your identity.

SSL certificates are provided by certification authorities (CA) to servers and websites. An SSL certificate is a file that includes two encryption keys: a public key and a private key that recipients use to decrypt messages. SSL certificates are mandatory for brand-customer communications due to data regulations such as those laid out by GDPR.

In summary, SSL email is a secure way of providing authentication and encryption during communication online between a client and a server. It is important for email security as it ensures confidentiality and account security. SSL certificates are mandatory for brand-customer communications due to data regulations such as those laid out by GDPR.