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How to telnet

Telnet is one of the way to verify whether the port is open either in your localhost or remote server. To telnet, follow
the steps below:
Open the command prompt.
Enter the command below in command prompt:
telnet IP_address/domain port_number
For example:
telnet 111.222.333.444 26
You should able to get the result as below: ESMTP Exim 4.69 #1 Mon, 13 Jun 2011 21:20:45 +0800
220-We do not authorize the use of this system to transport unsolicited,
220 and/or bulk e-mail.
421 SMTP command timeout – closing connection

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