Telnet/SMTP

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Telnet is a command-line tool that provides access to a command-line interface on a remote host. It may also be used to test Transmission Control Protocol (TCP) connectivity. These activities will show you how to use Telnet to test an HTTP connection.

Preparation[edit]

To prepare for this activity:

  1. Start Windows.
  2. Log in if necessary.
  3. Install the Telnet Client

Activity 1 - Test an SMTP Connection[edit]

To test an SMTP connection:

  1. Open a command prompt.
  2. Type telnet <smtp server> <port>, where <smtp server> is the name or IP address of the smtp server to test and <port> is the port number the SMTP server is using. The default SMTP port is 25. For example, to test a connection to one of Google's mail servers, type telnet gmail-smtp-in.l.google.com 25. Then press Enter.
  3. If the connection is successful, you will see a 220 response with the name of the mail server. Type quit and press Enter to close the connection.
  4. Close the command prompt to complete this activity.

Readings[edit]

References[edit]