Port 993 — IMAPS

TCP · Port 993/TCP is used for the secure transmission of Internet Message Access Protocol (IMAP) data, allowing users to access and manage email accounts securely. This port is particularly relevant in network security as it enables organizations to protect sensitive email communications from unauthorized access.

Port Number: 993
Service Name: IMAPS
Protocol: TCP
Common Software: Dovecot, Cyrus

Security Notes

Review IANA registry for port 993 usage. Apply principle of least privilege - only open ports that are required.

FAQ

What is port 993 used for?

Port 993 is used for IMAPS. Port 993/TCP is used for the secure transmission of Internet Message Access Protocol (IMAP) data, allowing users to access and manage email accounts securely. This port is particularly relevant in network security as it enables organizations to protect sensitive email communications from unauthorized access. Common software: Dovecot, Cyrus.

Is port 993 dangerous to leave open?

Review IANA registry for port 993 usage. Apply principle of least privilege - only open ports that are required.

How do I check if port 993 is open?

Use nmap: nmap -p 993 <target> or check locally: ss -tlnp | rg 993