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How to Test an SMTP Authentication With Telnet

How to Test an SMTP Authentication With Telnet thumbnail
Test SMTP authentication on your server by using Telnet login commands.

The Simple Mail Transfer Protocol sends email from your desktop to the recipient. SMTP runs on a network server, which routes the email to the correct recipient. You can test SMTP on a network server using a command line utility called Telnet. Telnet allows you to log into the SMTP server and authenticate. If authentication is a success, then you know it is functioning properly on your SMTP server.

Instructions

    • 1

      Click the Windows "Start" button. Enter "telnet <server> 25" into the text box and press "Enter." Replace "<server>" with your SMTP server. This makes an initial connection to the server's SMTP service. The "25" is the SMTP port on your server.

    • 2

      Enter "set LOCAL_ECHO" and press "Enter." This allows you to see the feedback from the server.

    • 3

      Enter "auth login" into the Telnet window and press "Enter." This prompts you for your SMTP user name and password.

    • 4

      Enter your user name and press "Enter." This prompts you for the password. Enter your password and press "Enter." If authentication is set up on your SMTP server, the server returns a success message, and you can send an email or close the session.

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