Sendmail
From KlavoWiki
On the Internet, sendmail is the most popular Unix-based implementation of the Simple Mail Transfer Protocol (SMTP) for transmitting e-mail.
Install Sendmail
yum install sendmail sendmail-cf
Automatic Startup
systemctl enable sendmail
Smarthost
Configuring Smart Host
edit /etc/mail/sendmail.mc
define(`SMART_HOST',`mail.tpgi.com.au')dnl
Compile Config
The new configuration file need to be compiled.
The preferred method is
sendmailconfig
m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
Restart Sendmail
service sendmail restart