I am having some trouble getting a PHP form to work properly on my website. Below is the mark-up, which can also be found on my website at http://www.shakethedisease.net/contact/ . The script was working for a few months, but now the webpage states "Notice: Undefined index: submit in /home/shakethe/public_html/contact.php on line 1" and "Notice: Undefined variable: mail in /home/shakethe/public_html/contact.php on line 34." Thanks for any input.

<?If ($_POST['submit']){
$from=$_POST['from'];
$body = wordwrap ($_POST['body'], 70); //this is because the mail function cannot have a line with more than 70 chars
$header = "From: $from <sitemailer@shakethedisease.net>";
$mail = mail('robert@shakethedisease.net', $_POST['subject'], $body, $header);
}?>


<?If ($mail) echo "Message sent."; ?>
<form action="<?=$PHP_SELF?><input type="hidden" name="phpMyAdmin" value="4594f30712f4fabaff6997416810f3f2" />" method="POST">
Name:<br /><input type="text" name="from" /><br />
E-mail:<br /><input type="text" name="subject" /><br />
Comments:<br /><textarea name="body"></textarea><br />
<input type="image" src="images/send.jpg?phpMyAdmin=4594f30712f4fabaff6997416810f3f2" name="submit" value="Send" />
<input type="image" src="images/reset.jpg?phpMyAdmin=4594f30712f4fabaff6997416810f3f2" name="reset" value="Reset" />
</form>

It worked, thanks!

What do you mean they aren't reaching your inbox? Are they going to your spam folder? Are you getting an error message? Has anything changed? You said it used to work before.

Have you tried talking to your hosting provider? They might have some restrictions on what you can do with the mail function.

Also, do you know if you are passing the values into the mail function?

try just sending an email like so, (maybe even try using a different email address, one that you know works)
<?
$mail = mail("robert@shakethedisease.net", "Here is my subject", "Here is my body", "sitemailer@shakethedisease.net");

if($mail){
echo 'It totally worked';
}else{
echo 'Didn't work';
}
?>

If the above code doesn't work, than I would just try talking to your hosting provider. They usually are quite helpful. :D

Pertinent to the topic, if not the question: I just built a few test forms via phpforms.org and so far so good, it's a nice little tool.

After some further thought I decided to switch back to my host's server. So now the form works with zero problems. Thanks to everyone for their help!