Which protocol is NOT supported for secure communication by MuleSoft?

MuleSoft supports various protocols to enable secure communication between systems and applications. In this context, the protocol that is not supported for secure communication is FTP.

FTP, or File Transfer Protocol, is primarily used for transferring files over the internet. However, it operates without encryption, which means that data—including usernames and passwords—can be vulnerable to interception during transmission. As a result, it does not meet modern security standards for secure communications.

In contrast, the other protocols mentioned do offer mechanisms for secure communication. HTTP can be secured through HTTPS, which uses SSL/TLS for encryption, ensuring that data transmitted over the web remains confidential and secure. SMTP (Simple Mail Transfer Protocol) can utilize STARTTLS to encrypt email transmissions, protecting sensitive information in transit. SFTP (SSH File Transfer Protocol) inherently uses SSH (Secure Shell) to establish a secure connection, providing strong security measures for file transfers.

Thus, the distinction lies in FTP's lack of any built-in security features, making it unsuitable for secure communication where data integrity and confidentiality are essential.