Web Form That's Submitted To An Email Address

<form action="contactme.php" mehod="post">
<p align="center">
<b><font size="2" face="Verdana">Name: <input type="text" name"username" size="30"/>
<br>
<br>
Email: <input type="text" name="useraddr" size="30">
<br>
<br>
Message: <textarea name="comments" cols="30" rows="5"> </textarea>
<br>
<br>
<input type="submit" value="Send Form"> </font></p>
</form></b>

<?PHP
#Where you want the email to go
$to = "Youremail@yoursite.com";

#subject of the message, change this
$re = "Feedbackfromcontactpage";

#message from the feedback form, don't touch this
$msg = $comments;

#send the mail, don't edit this
mail($to,$re,$msg);
header("location: thankyou.htm");
?>

<?PHP
#Where you want the email to go
$to = $_POST['useraddr'];

#subject of the message, change this
$re = "Feedbackfromcontactpage";
/*
*@header : this will show when the user click the reply button in the email client
*/
$header="From: Your own name<youremail@yoursite.com>\r\n";
$header.="Reply-to:<yourreplyemail@yourcompany.com>\r\n";


#message from the feedback form, don't touch this
$msg = $_POST['comments'];

//CHECK TO MAKE SURE THE EMAIL IS VALID

if(!preg_match("/^[^\s()<>@,;:\"\/\[\]?=]+@\w[\w-]*(\.\w[\w-]*)*\.[a-z]{2,}$/i",$email)){
echo "Enter a valid email address";

}else{
//if the email was valid lets send it

#send the mail, don't edit this
if(mail($to,$re,$msg,$header)){

echo " Your email has been sent! to $to.";
}else{
echo "<p> Error sending mail!</p>";
}//end sending email

}//end validate email

?>