push @files, $ftp->ls;

     my $new_file = 0;
     my $current_time_epoch = time;
     for my $file (@files) {
        if ( ($current_time_epoch - $ftp->mdtm($file) ) <= 3600 ) {
           $new_file = 1;
           last;
        }
     }

     envia_mail() if !$new_file;
     $ftp->quit or die $ftp->message;