StartTLS (Transport Layer Security) is a protocol extension that enhances the security of communication protocols, primarily used in email communication. It allows for the encryption of data transmitted between mail servers and clients, protecting the content from unauthorized access or tampering.
Traditionally, email communication was transmitted in plain text, making it vulnerable to interception and eavesdropping. StartTLS addresses this security concern by establishing an encrypted connection between the email client and the server, ensuring the confidentiality and integrity of the data transmitted.
StartTLS works by upgrading a plaintext connection to an encrypted one.