Debian – Why is exim4 listening on port 25

debianexim

Am I misinterpreting the results of netstat -anp --tcp --udp | grep LISTEN wrong, or does the output mean, that the process exim4 is listening to the outside on port 25:

tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      1960/exim4            
tcp6       0      0 ::1:25                  :::*                    LISTEN      1960/exim4

Could this be considered a security risk in a default Debian installation?

Best Answer

As you see, it only listens on localhost (both IPv4 and IPv6), so I suppose it is not a security risk, but better to wait for a guru to come in.

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