:50
(TCP/UDP)
Medium 风险
RE-MAIL-CK
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TCP/UDP — Email
端口概览
端口号
50
服务名称
RE-MAIL-CK
传输协议
TCP/UDP
类别
Email
安全风险
Medium
端口范围
知名端口 (0-1023)
什么是端口 50?
Remote Mail Checking Protocol. A legacy protocol that allows remote verification of mail addresses without sending a full message.
TCP/UDP
Email
安全注意事项
端口50（RE-MAIL-CK）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。