158
PCMail Server
Low RiskTCP/UDP — Email
Port Overview
Port Number
158
Service Name
PCMail Server
Transport Protocol
TCP/UDP
Category
Email
Security Risk
Low
Port Range
Well-Known (0-1023)
What is Port 158?
PCMail Server was an early distributed mail architecture protocol defined in RFC 1056. Entirely obsolete.
TCP/UDP
Email
Security Considerations
Port 158 (PCMail Server) is classified as low risk. This service uses encryption or has a minimal attack surface, making it relatively safe to expose.
Recommendation: Standard security practices apply. Keep software updated and monitor access.