Here is a simplified version of the way I process my php mail forms (though i have not included any error checking or field handling here ... just the send stuff)
// I set the static features (where its going and its subject
$to = 'emailaddress@theinternet.com';
$subject = 'Mail form query';
//Then I populate the from address and email body from my mail form
$body = "Comment/Query:" . $_POST['CommText'];
$from = "From: " . $_POST['EmailTxt'];
//then i send
mail ($to, $subject, $body, $from);
// and redirect to a confirmation page (where my pages are controlled by variables in the query string)
header("Location: ?hs=9");
//this could easily be "Location: thanks.php" or similar
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if you have more than one item you want to include in the message copy i.e. phone number, first name etc...
simply build the $body variable as follows
$body = "Name: " . $_POST['NameTxt'] . " ";
$body = $body . "PhoneNo: " . $_POST['PhoneTxt'] . " ";
$body = $body . "Comment/Query:" . $_POST['CommText'] . " ";
Hope this is of some help to you!