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netstat command with -a option

View the diagram below to observe the netstat command:
 The netstat command
The netstat command
  1. * under Local Address refers to the local machine.
  2. *.* under Foreign Address means that any incoming connection is acceptable.
  3. LISTEN means that the server indicated is waiting for a connection.
  4. This line means that the server is listening on the SMTP port. This is the email server (Mail Transfer Agent) awaiting incoming email.