How to send email using perl

[Alexander Surbakti]

I try to search in google and I found this script with some of modify:

#!/usr/bin/perl
use CGI;

$send_to = param('send_to');

if ($send_to eq '') {
   
<FORM method="POST" action="?">
<INPUT type="text" name="send_to">
<INPUT type="submit">
</FORM>
}
else {
my $query    = new CGI;
my $sendmail = "/usr/sbin/sendmail -t";
my $reply_to = "Reply-to: alex at indo.com";
my $subject  = "Subject: Confirmation of your submission";
my $content  = "Thanks for your submission.";
my $to       = $query->param('send_to');
my $file     = "subscribers.txt";

unless ($to) {
  print $query->header;
  print "Please fill in your email and try again";
}

open (FILE, ">>$file") or die "Cannot open $file: $!";
print $to,"\n";
close(FILE); 

my $send_to  = "To: ".$query->param('send_to');

open(SENDMAIL, "|$sendmail") or die "Cannot open $sendmail: $!";
print SENDMAIL $reply_to;
print SENDMAIL $subject;
print SENDMAIL $to;
print SENDMAIL "Content-type: text/plain\n\n";
print SENDMAIL $content;
close(SENDMAIL);

print $query->header;
print "Confirmation of your submission will be emailed to you.";
}


The script I named with sendingmail.pl. When I run the script it just 
print  $to which is the email address I typed in form before submited 
and no email come in $to inbox.
As an addition, my perl script put in different server with our mail 
server. sendingmail.pl I put in cgi-bin at training.indo.com while our 
mail server is mail.indo.com. My question is what should I do with 
$sendmail? It seems that the path is belongs to sendmail in mail server.

thanks,
-alex-