How to Use the Telnet Texting Program
If you want to use Telnet to send a message, you can do so by logging in to your simple mail transfer protocol (SMTP) server. Telnet is a network protocol to connect to other destination hosts in the command line. Logging into an SMTP server via Telnet is a lengthy process and not recommended if you have another available email client to use instead. Using Telnet to send email messages, however, is an interesting process to learn.
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Instructions
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Click "Start", type "cmd.exe" and right-click the application link. Click "Run as administrator".
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Type "telnet server.com 25" replacing "server.com" with your SMTP server address, and "25" with the port number. Press "Enter". Type "HELO server.com" and press "Enter".
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Type "MAIL FROM:user@domain.com" replacing "user@domain" with your email address. Type "RCPT TO:email@address.com" replacing "email@address.com" with the recipient's email. Press "Enter".
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Type "DATA" and press "Enter". Type "SUBJECT:subject title". Press "Enter" twice. Type your message.
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Press "Enter" when you have finished typing your message, then type "." and press "Enter" again.
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