Is port 220 (IMAP3) dangerous?

Port 220 is classified as medium risk. It is commonly exposed but consider using encrypted alternatives where available and monitor activity.

Should port 220 be open on my firewall?

Port 220 can be open but should be monitored closely. Keep the service updated and prefer encrypted alternatives where available.

Port 220 (IMAP3) uses the TCP transport protocol and falls under the Email category.

:220 (TCP)

Medium Risk

TCP — Email

Port Number 220

Service Name IMAP3

Transport Protocol TCP

Category Email

Security Risk Medium

Port Range Well-Known (0-1023)

Port 220 is assigned to IMAP3, an early version of the IMAP email retrieval protocol superseded by IMAP4 on port 143. Obsolete.

TCP Email

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.