PHP script for email

[Brightfuture_1]

Hello,

I just set up a website and I wanted to be able to use a contact form and have that information sent to me via email. I have a php script. When I try to submit the information in the contact form, I get an error 500 saying my site was not set up to do that. Is there some configuration I need to do? Sorry I'm new to this.
Thank you

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My method for getting emails from the contact page might not be the best. If anyone could suggest a tool I could use that would be more secure and reliable, I would be grateful. Thank you!

[Ron-e]

without seeing the script it's just a guessing game.

[Brightfuture_1]

PHP Code:

<?php
/*
This first bit sets the email address that you want the form to be submitted to.
You will need to change this value to a valid email address that you can access.
*/
$webmaster_email = "name@domain.com";

/*
This bit sets the URLs of the supporting pages.
If you change the names of any of the pages, you will need to change the values here.
*/
$feedback_page = "feedback_form.html";
$error_page = "error_message.html";
$thankyou_page = "thank_you.html";

/*
This next bit loads the form field data into variables.
If you add a form field, you will need to add it here.
*/
$email_address = $_REQUEST['email'] ;
$name = $_REQUEST['name'] ;
$nationality = $_REQUEST['nationality'] ;
$age = $_REQUEST['age'] ;
$city = $_REQUEST['city'] ;
$major = $_REQUEST['major'] ;

$bachelor =$_REQUEST['bachelor'] ;
$master = $_REQUEST['master'] ;
$phd = $_REQUEST['phd'] ;
$diploma = $_REQUEST['diploma'] ;
$chinese = $_REQUEST['chinese'] ;
$other = $_REQUEST['other'] ;


$comments = $_REQUEST['comments'] ;

$msg = 
"First Name: " . $name . "\r\n" . 
"Email: " . $email_address . "\r\n" . 
"Nationality: " .$nationality . "\r\n".
"Age: " . $age . "\r\n".
"Desired City: " . $city . "\r\n".
"Desired Major: " . $major . "\r\n".

"Bachelor: " . (isset($bachelor) ? "Bachelor Yes" : "Bachelor No") . "\r\n" .

  "Masters: " . (isset($master) ? "Master Yes" : "Master No") . "\r\n" .

  "PhD: " . (isset($phd) ? "PhD Yes" : "PhD No") . "\r\n" .

"Diploma: " . (isset($diploma) ? "Diploma Yes" : "Diploma No") ."\r\n" .

"Chinese: " . (isset($chinese) ? "Chinese Yes" : "Chinese No") . "\r\n" .
"Other: " . (isset($other) ? "Other Yes" : "Other No") . "\r\n" .
    "Comments: " . $comments . ;

/*
The following function checks for email injection.
Specifically, it checks for carriage returns - typically used by spammers to inject a CC list.
*/
function isInjected($str) {
    $injections = array('(\n+)',
    '(\r+)',
    '(\t+)',
    '(%0A+)',
    '(%0D+)',
    '(%08+)',
    '(%09+)'
    );
    $inject = join('|', $injections);
    $inject = "/$inject/i";
    if(preg_match($inject,$str)) {
        return true;
    }
    else {
        return false;
    }
}

// If the user tries to access this script directly, redirect them to the feedback form,
if (!isset($_REQUEST['email_address'])) {
header( "Location: $feedback_page" );
}

// If the form fields are empty, redirect to the error page.
elseif (empty($first_name) || empty($email_address)) {
header( "Location: $error_page" );
}

/* 
If email injection is detected, redirect to the error page.
If you add a form field, you should add it here.
*/
elseif ( isInjected($email_address) || isInjected($first_name)  || isInjected($comments) ) {
header( "Location: $error_page" );
}

// If we passed all previous tests, send the email then redirect to the thank you page.
else {

    mail( "$webmaster_email", "Feedback Form Results", $msg );

    header( "Location: $thankyou_page" );
}
?>

without seeing the script it's just a guessing game.

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Thanks for directing my attention to the code. I tried a different PHP script, and the email was successful. I appreciate your help