ecco un'altro problema..

prima di tutto grazie, non mi da più quell'errore

ma non mi arriva la mail quando faccio la registrazione!!!!

questo è il codice:

<?PHP
//retrieve al the variables that had been submited by the from
$username1 = $HTTP_POST_VARS["username"];
$mailadres1 = $HTTP_POST_VARS["mailadres"];
$password1 = $HTTP_POST_VARS["password"];
$confirmpassword1 = $HTTP_POST_VARS["confirmpassword"];
//generate an random number for the user neede to activate there account
$actnum = rand( 1,999999999999);
//make sure that the activation number is positive (YES it can happen that the number is negatief.)
if ($actnum < 0){$actnum = $actnum + ($actnum*-2); }
//set the error variable to an empty string.
$error = "";

//check it the fields are not empty. if they are, append the error to the error variable ($error)
if ($username1 == ""){$error = "$error[*]No username given
\n";}
if ($password1 == ""){$error = "$error[*]No password given
\n";}
if ($mailadres1== ""){$error = "$error[*]No mailadres given
\n";}
//check if the passwords match. if they don't append the error to the error variable ($errir)
if ($password1 <> $confirmpassword1) {$error = "$error[*]Passwords do not match
\n";}

// let the config.php file make an database connection
include("config.php");
//make an query which checks if the username OR the emailadres ar in the database. if they are append an error.
$query = "Select * from signup where username='$username1' or mailadres='$mailadres1'";
$result = mysql_query($query);
if ($row = mysql_fetch_array($result)){
if ($row["username"] == $username1){$error = "$error[*]Your username is already used by another member
\n";}
if ($row["mailadres"] == $mailadres1){$error = "$error[*]Your e-mail adres is already registrated in our database
\n";}
}

//if ther error variable is still an empty string. The summission was oke and you can start proccesing the submission
if ($error == ""){
//first we check wat the date and time is for the signupdate field
$datetime = date("d-m-Y G:i ");
//then we submit al this to the database
$query = "INSERT INTO signup (username, password, mailadres, actnum, userlevel, signupdate ,lastlogin, lastloginfail, numloginfail) VALUES ('$username1','$password1','$mailadres1','$actnum' , '1', '$datetime','0','0','0')";
$result = mysql_query($query);
//and we make an (e-mail)message which contains the activation numer
//also possible is to put a link in that message like :
//http:// your url /activate.php?username=$username1&actnum=$actnum
//this would allow the user to direcly submit there activation without having to enter
//al the data again in the activation form
$message = "Activation number: $actnum";
// mail the message to the user
mail($mailadres1, "Sign up script user activationcode", $message, "From: Sign-up script");
// and redirect the user to the activation page
header("Location: activate.php");
}
else
//if $error is no longer a empty stirng there must have been error in the submision.
//here we echo an nice line which says there are a coulple of errors and we onpen an
//unorder list (just the <ul> tag) and we prinnt the error. also we include a link back to the
//sign-upform
{echo "You could not be added to the database because of the following reasons<ul>
$error[/list]Please return to <a href=\"signup.php\">signup form</a> and try again.";
}
?>