Simple Mail Transfer Protocol is an international standard to send mails between servers using Internet Protocol (IP).
“sendmail” is an application on the Linux system which uses SMTP to send mails.
How to install SMTP on Linux?
# yum install sendmail
How to start the SMTP service on Linux?
# service sendmail start OR /etc/init.d/sendmail start
How to stop the SMTP service on Linux?
# service sendmail stop OR /etc/init.d/sendmail stop
How to check the status of the SMTP service on Linux?
# service sendmail status OR /etc/init.d/sendmail status
What is the default port for the SMTP server?
25
How to check the SMTP port is listening or not on Linux?
netstat –nat | grep 25