Before we go ahead with its installation and configuration process, lets understand how it works. Once it has been installed and configured on any Linux system, all emails from root, nobody or any other such applications will be forwarded to SSMTP. We can also configure our PHP, Python, Ruby applications to forward their emails to this utility, SSMTP uses the concept of Mailhub. Mailhub could be either Gmail SMTP server or Microsof Office365 SMTP server. As soon as it gets email , it forwards this email to the configured Mailhub and the email is delivered to the destination address using your specified Google/Office365 address.