![]() The server will respond with: 221 2.0.0 Bye If you want to send out another message, repeat steps 4-6, otherwise, type in quit: quit When you are done typing in the message body, hit the enter key, then type in a. Type in the message you want to be included in the body: This is a test! The server will then notify you that it is now OK to provide the data. The next step is to tell the server data is coming for the body of the message: data If there is some problem with the recipient-address, your mail will bounce. Provide the server to who you want to send the e-mail. The server should respond with something like: 250 2.1.0 OK Step 4 Next, provide the mail from the address. Depending on your mail server’s security settings, the mail form may be required to be from a certain domain suffix: mail from: The response will also vary from server application type and version. If the server accepts your input, you should expect the following in return: 250 Hello If your computer name is, then type in the following: helo However, the 220 response indicates that you made a successful connection. The response will vary depending on the SMTP server software. This will open a TELNET window, and you should expect a response such as: 220 ESMTP MAIL Service, Ready ![]() Open a command prompt and connect to the SMTP server using TELNET over port 25. ![]() Of course, your SMTP server must be configured to allow for mail relaying. This article provides a quick summary of the common SMTP commands and sequence used by the SMTP Protocol to transfer email via the TELNET command. If you have ever needed to run a test to verify if your SMTP server can relay email, a simple way of doing so without having to load another SMTP server or run an SMTP client application is to use the TELNET command. ![]()
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