Port 993 is used when an email client wants to retrieve emails from a server securely using the Internet Message Access Protocol over Secure Sockets Layer (SSL). This allows for encrypted communication between the email client and server, preventing potential eavesdropping or interception of sensitive information.
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What is SSL and why is it important for email communications?
What is the difference between IMAP and POP3 for email retrieval?
What could happen if email is retrieved without encryption?