SMTP (Simple Mail Transfer Protocol) is a protocol used for sending email messages between servers. SMTP is widely used by email clients and servers to send and receive email messages. SMTP testing is important to ensure that email servers are properly configured and functioning correctly. In this guide, we will show you how to perform an SMTP test command in Linux.
Step 1: Install telnet
The first step is to install telnet if it is not already installed on your Linux system. Telnet is a command-line tool used for connecting to remote servers using the Telnet protocol. To install telnet on Ubuntu/Debian, run the following command:
sudo apt-get install telnet
To install telnet on CentOS/Fedora, run the following command:
sudo yum install telnet
Step 2: Connect to SMTP server
To perform an SMTP test command, we need to connect to the SMTP server using telnet. To connect to the SMTP server, open a terminal and run the following command:
telnet mail.example.com 25
Replace “mail.example.com” with the hostname or IP address of the SMTP server. “25” is the default SMTP port.
Step 3: Send a test email
Once you have connected to the SMTP server, you can send a test email by entering the following commands:
EHLO example.com MAIL FROM: <firstname.lastname@example.org> RCPT TO: <email@example.com> DATA Subject: Test email Hello, This is a test email. . QUIT
The first command “EHLO example.com” identifies the sending host and initiates the SMTP session. Replace “example.com” with your domain name.
The second command “MAIL FROM:
The third command “RCPT TO:
The fourth command “DATA” initiates the data transfer for the message body.
The fifth command is the actual message body. Replace the subject and message with your own.
The sixth command “.” indicates the end of the message body.
The seventh command “QUIT” terminates the SMTP session.
Step 4: Check the email inbox
After sending the test email, check the recipient’s email inbox to verify that the email was received. If the email was received, the SMTP test command was successful.
- telnet – a command-line tool for connecting to remote servers using the Telnet protocol
In this guide, we have shown you how to perform an SMTP test command in Linux. SMTP testing is important to ensure that email servers are properly configured and functioning correctly. Remember to replace “mail.example.com”, “firstname.lastname@example.org”, and “email@example.com” with the actual values in the commands.