220
IMAP3
Medium RiskTCP — Email
Port Overview
Port Number
220
Service Name
IMAP3
Transport Protocol
TCP
Category
Email
Security Risk
Medium
Port Range
Well-Known (0-1023)
What is Port 220?
Port 220 is assigned to IMAP3, an early version of the IMAP email retrieval protocol superseded by IMAP4 on port 143. Obsolete.
TCP
Email
Security Considerations
Port 220 (IMAP3) is classified as medium risk. While this service is commonly exposed, consider using encrypted alternatives where available.
Recommendation: Keep the service updated. Monitor logs for unusual activity.