A standard installation that is using the default values will be working just out of the box. It will be setup by default to use the PHP Main function to send email messages. The settings can be modified via the Joomla admin area -> Site -> Global Configuration -> Server. The corresponding settings are found under the Mail Settings section.
Bear in mind that the email address which you are using for “Mail from” should be of type This email address is being protected from spambots. You need JavaScript enabled to view it.. You cannot use this functionality to send email messages using fake address.
The second option is to use the SMTP Server for sending email messages via Joomla. In this case you need to turn on SMTP Authentication and supply correct details for the SMTP Server you will be using as show below:
On SiteGround servers the options should be setup as follows:
SMTP Authentication – Yes
SMTP Security – None
SMTP Port – 25
SMTP Username – This email address is being protected from spambots. You need JavaScript enabled to view it. Note that you should use the full email address as username including the @domain part.
SMTP Password – The correct password for the email account you supplied as Username.
SMTP Host – This can be your domain name.