Mail supports different types of backends to send email. So two steps are necessary to send an email.
Create a new instance of a specific Mail-Backend with the factory() method.
Send the mail using the send() method.
Mail supports three types of backends:
mail
Sends a mail using PHP's built-in mail() function.
sendmail
Sends a mail using a sendmail program.
smtp
Sends a mail directly connecting to a smtp server.