Validating and Passing form data to Thanks Page

Hi all, SERIOUS newb here just beginning to look into php. I've tried a few
solutions to my issue from snippets I've seen, but so far nothing has
worked.

In an attempt to stop email harvesting and SPAM issues (I get about 2,400
every 24 hours), I'm making my contact forms use the php form handler from
Sitewizard. The email from the form sends OK, and my Thanks page loads, but
I'd like to carry the value the user entered for their email into the Thanks
page. Previously I used a FrontPage component to show it, but putting this:

<?
print "Email you entered is $_POST['email']\n";
?>
just leaves that part of the page blank. I tried using a php extension on
the page instead of htm, but that didn't help. PHP does work on the Windows
2003 server.

The Sitewizard form has the following:

<form action="feedback.php" method="post">
<table border="0" cellpadding="8" cellspacing="8" summary="feedback form">
<tr><td>Name:</td><td><input type="text" name="name" size="25" /></td></tr>
<tr><td>Email address:</td><td><input type="text" name="email" size="25"
/></td></tr>
<tr>
<td colspan="2">
Comments<br />
<textarea rows="15" cols="45" name="comments">
</textarea>
</td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="submit" value="Send Feedback" /><br />
</td>
</tr>
</table>
</form>

The Sitewizard formhandler (feedback.php) has the following (with the actual
working entries replaced w/ generic labels):

<?
$mailto = 'MyEmailAddress';
$subject = "Email Subject Line" ;
$formurl = "URL_of_form.htm" ;
$errorurl = "URL_of_Error_page.htm" ;
$thankyouurl = "URL_of_ThanksPage.htm" ;

ini_set ("SMTP", "mymailserver");

$name = $_POST['name'] ;
$email = $_POST['email'] ;
$comments = $_POST['comments'] ;
$http_referrer = getenv( "HTTP_REFERER" );

if (!isset($_POST['email'])) {
header( "Location: $formurl" );
exit ;
}
if (empty($name) || empty($email) || empty($comments)) {
header( "Location: $errorurl" );
exit ;
}
$name = strtok( $name, "\r\n" );
$email = strtok( $email, "\r\n" );
if (get_magic_quotes_gpc()) {
$comments = stripslashes( $comments );
}

$messageproper =

"This message was sent from:\n" .
"$http_referrer\n" .
"------------------------- COMMENTS -------------------------\n\n" .
$comments .
"\n\n------------------------------------------------------------\n" ;

mail($mailto, $subject, $messageproper, "From: \"$name\"
<$email>\r\nReply-To: \"$name\" <$email>\r\nX-Mailer: chfeedback.php
2.04" );
header( "Location: $thankyouurl" );
exit ;
?>

On the Thanks page, I tried putting:

<?
print "You entered email as $_POST ['email']\n" ;
?>
and several other variations, excluding the apostrophes, then the brackets,
several different combinations, etc.; you know, the usual attempts to see if
the problem was my syntax.

Can anyone tell me how this can be done?

If you have the time, I'd also like to know if there's a way with php to
validate that the email field was filled in (currently use FrontPage's
validation rule that just pops up a "no email address" error when user
attempts to click Send button).

If this belongs in a different group, please lead me in the right direction.

Thanks for reading, and for any help. I hope I don't wear out my welcome
while I start learning php.

I'm also a supreme newb so beware.

print "You entered email as $_POST ['email']\n" ; doesn't work because
you POSTed to "feedback.php" not to your thanks page. My newbie fix
would be to modify the last few lines of feedback.php like this:

----------SNIPPET-------------
$email = rawurlencode($email);
header( "Location: $thankyouurl?email=$email" );
exit ;
----------END SNIPPET-------------

Then modify your thanks page like this:
<?
$email = rawurldecode($_GET['email']);
print "You entered email as $email\n";
?>

Second question:
It looks like feedback.php already verifies that the user entered
something (not necessarily an email address) in the email field.

----------SNIPPET-------------
if (!isset($_POST['email'])) {
header( "Location: $formurl" );
exit ;
----------END SNIPPET-------------

Again, I'm a newb so use at your own risk.