An IT specialist is tasked with configuring a company's new email server. The team wants to ensure that outbound email is encrypted using the method most commonly negotiated on TCP port 587. Which configuration setting should the specialist enable to meet this requirement?
Port 587 is reserved for SMTP message submission. By default, it begins as an unencrypted session and should be upgraded to TLS with the STARTTLS command. Enabling STARTTLS on the server (and requiring clients to use it) ensures that each message is encrypted after the initial handshake. Using plain SMTP on port 587 does not guarantee encryption; implicit SSL/TLS requires port 465 instead, and IMAP is a different protocol entirely.
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