Check SMTP Functionality: Linux Command Line [Closed]

If you're looking for a way to check SMTP functionality on Linux command line, there are a few different commands you can use. One of the most commonly used is the telnet command, which allows you to connect to a remote server and test SMTP functionality by sending a test email.

To use the telnet command, first open a terminal window and type "telnet" followed by the IP address or hostname of the SMTP server you want to test. Then, enter the command "EHLO" to identify yourself to the server and start the SMTP session. You can then use the "MAIL FROM" and "RCPT TO" commands to specify the sender and recipient email addresses, respectively. Finally, use the "DATA" command to start the message body and enter the content of the test email. Once you're done, use a single "." on a new line to end the message and send it to the server.

Alternatively, you can also use the nc (netcat) command to test SMTP functionality. Simply type "nc" followed by the IP address or hostname of the SMTP server and the SMTP port number (usually 25). You can then manually enter the same SMTP commands as with the telnet method.

It's important to note that both of these methods require a basic understanding of SMTP protocol and syntax. If you're unfamiliar with these concepts, it may be helpful to consult with a more experienced user or IT professional. With these commands, you can easily check SMTP functionality on Linux command line and troubleshoot any issues you may encounter.

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