Why would a mailer.php file stop working?

[expatabroad]

Hi there - I am sorry but I have little knowledge of php but have a mailer.php file on the website that I maintain. The idea is that the user of the website completes a registration form and when they click on the submit button three things should happen, a confirmation e-mail is sent to their mail box, a message appears on the screen to say that the application has been accepted and a second e-mail should be sent to the e-mail address associated with the website. However, the third (and most vital part ) of this transaction has just stopped working ie we are not receiving any applications. I have not made any change to the mailer.php file or the HTML page which interfaces with it. Can somebody kindly suggest what may have caused it the cease functioning?? Many thanks

mailer.php :-
?

$webmaster = "EMAIL REMOVED - Send PM to This User Instead";

$sender = "EMAIL REMOVED - Send PM to This User Instead";

$headerwebmaster = "Enquiry";
$bodywebmaster = "$title $name $surname ($email) wrote:
$message";

$headersender = "The British Club of the Taunus e.V.";
$bodysender = "Thank you for your interest in our site. \n Your Message was:\n $message\n";

$failedmail = "Sorry, your e-mail address is wrong. Please go back and try again.";

$space = "Sorry, you have not filled in all the required fields.";

$sent = "Your enquiry was sent successfully.";

$delivered = "A confirmation e-mail has been sent to you.";

if ($name == "" || $surname =="" || $email =="" || $message =="")

{

echo "$space";
}
else
{

if (ereg("^{[a-zA-Z0-9-]+(.[a-zA-Z0-9-]+)*@([a-zA-Z0-9-]+.)+([a-zA-Z]{2,3})$",} $email))
{

mail("$webmaster","$headerwebmaster","$bodywebmaster\n","FROM: $sender\n");

if ($receipt == "yes")
{
mail("$email","$headersender","$bodysender","FROM: $webmaster\n");
echo "$delivered";
}
else
{
echo "$sent";
}
}
else
{

echo "$failedmail";
}
}
?>

[sneakyimp]

sadly, sending mail involves many factors. Your domain may have been flagged as a source of spam by the people to whom you are sending mail. your hosting provider may have changed their configuration, etc.

your script doesn't exactly show all the things that you might be doing, but it might have been hijacked by a botnet to send mail. in that case, it is very likely that your domain is considered a source of spam.

[NogDog]

One possibility is that register_globals has been turned off (which is now the preferred mode). Therefore, the variables for the form data now have no values. The simplest solution (and one that will keep your script portable as it will work regardless of the register_globals setting) would be to set those variables at the start of your script:

<?php
$email = $_POST['email'];
$name = $_POST['name'];
// etc....
//

See http://www.php.net/manual/en/security.globals.php for more info about register_globals.