Thanks for the tip. I rewrote the untaint subroutine as follows (borrowing from perlsec):

sub untaint {
   my $s = $_[0];
   if ($s =~ /^([\w \-\@\(\)\,\.\/]+)$/) {
      $s = $1;               # $data now untainted
    } else {
      die "Bad data in $s";  # log this somewhere
    }  
    return $s;
}
[download]

When I get home, I'll look into writing a separate untaint subroutine for each field, but is this more correct than the original?

Thanks again.