How To Check SMTP Server Configuration In Linux?

1. How To Check SMTP Configuration In Linux? 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. sudo yum install telnet Installing ncat or nc: In order to install the ncat protocol, run the sudo yum install nmap-ncat -y command in the terminal window. Method 1: Checking the SMTP connection using the Telnet While checking the SMTP configuration in Linux usually, the SMTP servers use ports such as 25, 2525, and 587 for communications. Now, on the Terminal window, type the following command: telnet [your hostname] [port no] Here, replace “your hostname” with the name of your host and “port no” with your smtp server ports. Tap the Enter button. Now, your SMTP server configuration details and the status will be displayed on the screen. Method 2: Checking the SMTP connection using Ncat or Nc In the Terminal window, run the following command: nc -v -u smtp.example.com port_no If your SMTP connection status is connected, then you can see the following commands, that help to check SMTP configuration in Linux: [root@xxxxx auth]# ncat -v -u smtp.domain.com port Ncat: Version x.xx ( https://nmap.org/ncat ) If you want to know more settings about SMTP server click the below read more button. Read More