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 风险

TCP — Email

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端口号 220

服务名称 IMAP3

传输协议 TCP

类别 Email

安全风险 Medium

端口范围知名端口 (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Port 220 is assigned to IMAP3, an early version of the IMAP email retrieval protocol superseded by IMAP4 on port 143.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

端口220（IMAP3）被归类为中等风险。虽然此服务通常会暴露，但请在可用时考虑使用加密替代方案。

建议：保持服务更新。监控日志以发现异常活动。