mail() function

How to use mail() to send email to free account email/any email for hotmail, yahoo email account etc?

Here my code

[code=php]
<?php
// Your email address
$email = “[email protected]”;

// The subject
$subject = “Enter your subject here”;

// The message
$message = “Enter your message here”;

mail($email, $subject, $message, “From: $email”);

echo “The email has been sent.”;
?>
[/code]

When sent, got error message “Warning: mail() [function.mail]: SMTP server response: 550 5.7.1 Unable to relay for [email][email protected][/email] in C:xampphtdocsexamplemail.php on line 11″.

How to solve that problem so that the mail() actually can sent mail?

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