On this web page, we’ll show you how to check SMTP configuration in Linux using the Telnet, and ncat protocols.
If you haven’t installed any of the protocols mentioned above, then first install it. To install the Telnet protocol on Linux, open the Terminal window and run the below mentioned command in it.
Installing ncat or nc:
In order to install the ncat protocol, run the sudo yum install nmap-ncat -y command in the terminal window.
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