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De-activating telnet command

My e-mail server accepts that people outside can execute the command "telnetmail.myorg.com 25," with which they can send anonymous e-mail with no password. It is possible to close this possibility and to continue sending and receiving e-mail?


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No, not unless you turn off all e-mail services. The SMTP listener (server) must be on port 25 for e-mail to work properly. The server has no way of knowing what CLIENT software was used to connect to it.


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This was first published in February 2002

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