How to Check for Outbound SMPT Connections
Simple Mail Transfer Protocol (SMTP) is a computer process used to send and receive emails over an Internet connection. If you would like to check your outgoing SMTP connection, you can use the "Telnet" command on your Windows computer. Running this command will tell you whether or not your SMTP connection can get through the email server you are trying to communicate with. You do not have to download anything to run this command. You can run Telnet through pre-installed programs on the computer system.
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Instructions
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Click the "Start" button, and then click the "Search" box. Type "cmd" into the "Search" box. Press the "Enter" button on your keyboard.
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Type "telnet" into the "Command Prompt," and then press "Enter" to get into the protocol. Type "SET LOCALECHO" and press "Enter." This allows you to see the responses from the commands.
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Type "o <mail server domain> 25" into the prompt, and then press the "Enter" button. "25" is the port number that your SMTP message is going through. Wait for the feed to come back to your computer with a "Success" prompt.
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Type "MAIL FROM sender@domain.com" into the prompt and press "Enter." This command tests the SMTP connection from a sender. If you get an error, there is a problem on their end of the SMTP server.
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