qmail-inject not working for users?

[devindull]

We have a form mailer script and it originally was made to use sendmail, however since sendmail isn't a smart venture, we tried qmail-inject. The script is a working script, it's worked on many other servers with sendmail, although they haven't had Plesk installed.

After submitting the form (POST formmail.cgi) the server reponds saying:

Method Not Allowed
The requested method POST is not allowed for the URL /mailer/formmail.cgi.
--------------------------------------------------------------------------------
Apache/1.3.33 Server at www.tommywho.com Port 80

Here's the script we use:
#!/usr/bin/perl

$mailpath='/usr/local/psa/qmail/bin/qmail-inject*';
$address='[email protected]';

print "Location: http://www.tommywho.com/index.php\n\n";
print "Content-type:text/html\n\n";

if ($ENV{'REQUEST_METHOD'} eq 'POST'){
read(STDIN, $buffer, $ENV{'CONTENT_LENGTH'});
$input=$buffer;
$input=~ s/&/\n/g;
$input=~ tr/+/ /;
$input=~ s/%([\da-f]{1,2})/pack(C,hex($1))/eig;

open (MAIL, "|$mailpath -t")or die ("wrong mailprog\n");
print MAIL "To: $address\n";
print MAIL "From: LT Site Question\n";
print MAIL "Subject: Question from LT website\n";
print MAIL "$input\n";
print MAIL "\n\n";
print MAIL "HTTP-FROM: $ENV{'HTTP_FROM'}\n";
print MAIL "REMOTE-HOST: $ENV{'REMOTE_HOST'}\n";
print MAIL "FROM IP NUMBER: $ENV{'REMOTE_ADDR'}\n";
close (MAIL);
}


Any ideas? Please help us.