you can use gmail account for this. here is the code sample for you
<?php
require_once "Mail.php";
$from = "<from.gmail.com>";
$to = "<to.yahoo.com>";
$subject = "Hi!";
$body = "Hi,\n\nHow are you?";
$port = "465";
$username = "<myaccount.gmail.com>";
$password = "password";
$headers = array ('From' => $from,
'To' => $to,
'Subject' => $subject);
$smtp = Mail::factory('smtp',
array ('host' => $host,
'port' => $port,
'auth' => true,
'username' => $username,
'password' => $password));
$mail = $smtp->send($to, $headers, $body);
if (PEAR::isError($mail)) {
echo("<p>" . $mail->getMessage() . "</p>");
} else {
echo("<p>Message successfully sent!</p>");
}
?> <!-- end of php tag-->