The class makes the magic true. Yes you can send emails through your PHP application like any email client do, such as Outlook express or Thunderbird. The combination with SMTP class is very useful for windows based PHP servers.
However, the examples needs more hard work to be utilized in-order to get a result, this is from windows and using SMTP to send a messsage. Examples needs one extra one to demonstarte sending MIME emails messages via SMTP specially using Gmail.