Here are a few more examples: Port Number However, you can use telnet to test any port you wish. In this example, we use port 25 to test SMTP. For example, it is sometimes used in debugging network services such as an SMTP, HTTP, FTP or POP3 server, by serving as a simple way to send commands to the server and examine the responses. Telnet is often used when diagnosing problems, to manually "talk" to other services without specialized client software.
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