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Exchange > Troubleshooting Email Delivery

What Is Telnet? How Do I Run It?


Telnet uses the Telnet protocol (part of the TCP/IP protocol suite) to connect to a remote computer over a network. You can execute telnet from the Command prompt (DOS prompt)


telnet [RemoteServer] [Port]

[RemoteServer]: specify the name of the server to which you want to connect. When you connecting to an email server you need to use the MX record value.

[Port]: enter the port that you want to use.

For Windows users:

  1. Go to Start > Run (or press Windows button+R).
  2. In the Run window type cmd and click OK to open Command prompt.

Examples of a Telnet session:

To connect to the Intermedia mail server (MX record) through SMTP port 25 type a command, similar to these examples:

telnet mail.your_domain.com 25
telnet west.smtp.exchXXX.serverdata.net 25
telnet mx1.smtp.exchXXX.msoutlookonline.net 25


To terminate Telnet session use the "quit" command.

Note for Windows Vista, Windows 7 and Windows 8  : by default, Windows Vista, Windows 7 and Windows 8 do not have the Telnet client enabled. To install Telnet, follow these steps:

  • Go to Start > Computer and then click Uninstall or change a program.


  • Then click Turn Windows features on or off and after you click Continue on the security prompt, you should see a list of components.


  •  Scroll down to Telnet Client and check the box next to it. Click Ok to install the client.


For Mac users:

If you have OS X, you can use the built-in network tools.

  1. Click Go > Utilities.
  2. In the Utilities folder open Terminal.
  3. In Terminal, type: telnet [hostname] [port].
Article ID: 1364
Keywords: telnet command prompt dos
Direct Path: http://hosting.intermedia.net/support/kb/viewKBArticle.asp?id=1364

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