OK, my domain has finally transferred, so, I can test this for real now.

When I click on my form's "submit" button, I get a web page that says:

502 Bad Gateway
Web server received an invalid response while acting as a gateway or proxy server.
Web Server at cometsoftware.com

The "Address" box in my browser has:

http://www.cometsoftware.com/cgi-bin/x123.pl


I have gone back and read over this thread and the "Can't quite figure out FormMail", and, I still can't get it to work (and, I'm not sure how this thread originator resolved his error).  So, let me review what I have and what I have done.


I am a new domain at Lunarpages on a Windows server.  My script is named "x123.pl" and was transferred via FTP "ASCII" to my domain's "cgi-bin" folder.  Perl is enabled for my domain.  These lines are in the configuration portion of the script:

shebang = #!C:/perl/bin/perl.exe
$mailprog = 'SMTP:cometsoftware.com';


These lines are in my html file:

<form name="contact_us" id="contact_us" method="post" action="/cgi-bin/x123.pl">
<input type="hidden" name="subject" value="Contact Us" />
<input type="hidden" name="required" value="realname,email,yourcomment" />
<input type="hidden" name="redirect" value="contact_us_success.htm" />


All of the "help" I have found for setting file permissions in Plesk seem to be referring to an older version than the one I am using.  So, I don't know what the script's permissions are, or are supposed to be, for the "Group or user names" panel.

I don't know where to go from here   

I really believe that the best way to handle form mailing is by creating your own simple mail client in perl, bypassing sendmail altogether.  Below is a sample script.  values inside of
braces ([...]) are meant to be replaced with your specific values.

----BEGIN CODE----
#!/usr/bin/perl

use strict;
use CGI::Carp qw(fatalsToBrowser);
use CGI qw/:cgi-lib -no_xhtml/;
use Mail::Mailer;

### User definable variables
my $mailhost = 'localhost';
my $mail_recipient = '[your_email@yourdomain]';
my $subject = '[Your Subject Line]';
###

my $cgi = new CGI;
send_email();

# This redirects clients to a prefabricated page upon completion, but
# it could just as easily be made to generate HTML output as a result.
redirect_client();

sub send_email {
    # All of the form variables are in the hash %form_vars.  Each form control name
    # is a key in the hash, e.g. $$form_vars{'email'}, 'email' being the form control name.
    my $form_vars = Vars;
    my $mailer = Mail::Mailer->new();
    $mailer->open({ From    => $$form_vars{'email'},
                    To      => $mail_recipient,
                    Subject => $subject,
                  })
        or die "Can't open: $!\n";
    print $mailer $$form_vars{'comments'};
    $mailer->close();
}

sub redirect_client {
    print $cgi->redirect('http://[yourdomain]/thankyou.html');
}

exit 0;
----END CODE----

Regards,

Rob