Need help with PHP mail script

i  have created a  log in system  . in when the  user completes the  registration process auto reply(auto-reply@domain)  generate and  sent users email id regarding user  name , password  (lo gin details). after formal approval admin  user will  user activation mail log in link.

but , problem is  these work mail accounts my  domain  only(test@domain). not send of above mentioned details  other  mail services gmail or yahoo etc.

 

i discussed this   others, said problem mail function   configuration. didn't needful information a  beginner  in php scripting.

i have contacted my  hosting service said the  problem with  php mail () function  , use php mailer() instead mail().
please give me solution same..

 

here ataching code..

 

<?php


include 'dbc.php';

$err = array();
                    
if($_post['doregister'] == 'register')
{

foreach($_post $key => $value) {
    $data[$key] = filter($value);
}

if(empty($data['full_name']) || strlen($data['full_name']) < 4)
{
$err[] = "error - invalid name. please enter atleast 3 or more characters name";
//header("location: register.php?msg=$err");
//exit();
}

// validate user name
if (!isuserid($data['user_name'])) {
$err[] = "error - invalid user name. can contain alphabet, number , underscore.";
//header("location: register.php?msg=$err");
//exit();
}

// validate email
if(!isemail($data['usr_email'])) {
$err[] = "error - invalid email address.";
//header("location: register.php?msg=$err");
//exit();
}
// check user passwords
if (!checkpwd($data['pwd'],$data['pwd2'])) {
$err[] = "error - invalid password or mismatch. enter 5 chars or more";
//header("location: register.php?msg=$err");
//exit();
}
     
$user_ip = $_server['remote_addr'];

// stores sha1 of password
$sha1pass = pwdhash($data['pwd']);

// automatically collects hostname or domain  example.com)
$host  = $_server['http_host'];
$host_upper = strtoupper($host);
$path   = rtrim(dirname($_server['php_self']), '/\\');

// generates activation code simple 4 digit number
$activ_code = rand(1000,9999);

$usr_email = $data['usr_email'];
$user_name = $data['user_name'];


$rs_duplicate = mysql_query("select count(*) total users user_email='$usr_email' or user_name='$user_name'") or die(mysql_error());
list($total) = mysql_fetch_row($rs_duplicate);

if ($total > 0)
{
$err[] = "error - username/email exists. please try again different username , email.";

}


if(empty($err)) {

$sql_insert = "insert `users`
              (`full_name`,`user_email`,`pwd`,`address`,`tel`,`fax`,`website`,`date`,`users_ip`,`activa tion_code`,`country`,`user_name`
            )
            values
            ('$data[full_name]','$usr_email','$sha1pass','$data[address]','$data[tel]','$data[fax]',' $data[web]'
            ,now(),'$user_ip','$activ_code','$data[country]','$user_name'
            )
            ";
           
mysql_query($sql_insert,$link) or die("insertion failed:" . mysql_error());
$user_id = mysql_insert_id($link); 
$md5_id = md5($user_id);
mysql_query("update users set md5_id='$md5_id' id='$user_id'");
//    echo "<h3>thank you</h3> received submission.";

if($user_registration)  {
$a_link = "
*****activation link*****\n
http://$host$path/activate.php?user=$md5_id&activ_code=$activ_code
";
} else {
$a_link =
"your account *pending approval* , activated administrator.
";
}

$message =
"hello \n
thank registering us. here login details...\n

user id: $user_name
email: $usr_email \n
passwd: $data[pwd] \n

$a_link

thank you

administrator
$host_upper
______________________________________________________
this automated response.
***do not respond email****
";

    mail($usr_email, "login details", $message,
    "from: \"member registration\" <auto-reply@$host>\r\n" .
     "x-mailer: php/" . phpversion());

  header("location: thankyou.php"); 
  exit();
    
     }
}                    

?>

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