ISP closes php form because of spam abuse

Hi experts, my ISP says that my simple php script that handles a simple contact form is abused by spammers. What may I do to redeem this?

The script recides in a separate file from the form:
$email = $HTTP_POST_VARS[email];
$mailto = "";
$mailsubj = "Response from $name";
$mailhead = "From: $email\n";
reset ($HTTP_POST_VARS);
$mailbody = "This is a message from $name:\n";
while (list ($key, $val) = each ($HTTP_POST_VARS)) { $mailbody .= "$key : $val\n"; }
if (!eregi("\n",$HTTP_POST_VARS[email])) { mail($mailto, $mailsubj, $mailbody, $mailhead); }



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Richard QuadlingSenior Software DeveloperCommented:
A quick lesson.


Here end'th the lesson.

Personally, I would take a look at

If I put a form on my website that posts to yours, your script will send out emails for me.
All I'd have to do is supply the 'email' variable and put extra header information in it too, like cc or bcc.

You should detect where your post is coming from and validate all entries, before sending anything out.

To ensure people use your form and not just submit from somewhere else, you could also set a session variable with a random value when creating the form, including it in a hidden value, and when its submitted match them up.

Although most of these can be faked, good validation should be enough to prevent spammers sending out emails via your site.

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Sparkle101Author Commented:
Yes, I found out this too. I finally ended up with this script that detects cc and bcc and other and sends an error:


$error = "";

// get all the email form data

$ems = "";

// stop email server hacks
$ems .= $name;
$ems .= $email;
$ems .= $message;

if ( stristr( $ems, "content-type" ) || stristr( $ems, "multipart/mixed" ) || stristr( $ems, "boundary" ) || stristr( $ems, "cc:" ) || stristr( $ems, "multi-part message in mime format" ) || stristr( $ems, 'to:' ) || eregi( "(%[a-f0-9])", $ems ) || stristr( $ems, "0x" ))
// the last two are in case they try using hex or other non standard characters
$error .= "<p>Behave!!</p>";

if ( $error )
echo $error;

$name = stripslashes($name);
$email = stripslashes($email);
$subject = stripslashes("Responce from my form");
$text = stripslashes($message);
mail('',$subject,$text,"From: $name <$email>");
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