while(1) {
  # Perform search
  my $mesg = $ldap->search( @args );

  # Filtering results for proxyAddresses attributes
  foreach my $entry ( $mesg->entries ) {
    my $name = $entry->get_value( "cn" );
    # LDAP Attributes are multi-valued, so we have to print each one.
    foreach my $mail ( $entry->get_value( "proxyAddresses" ) ) {
      # Test if the Line starts with one of the following lines:
      # proxyAddresses: [smtp|SMTP]:
      # and also discard this starting string, so that $mail is only the
      # address without any other characters...
      if ( $mail =~ s/^(smtp|SMTP)://gs ) {
         push(@valid, $mail." OK\n");
      }
    }
  }

  # Only continue on LDAP_SUCCESS
  $mesg->code and last;

  # Get cookie from paged control
  my($resp)  = $mesg->control( LDAP_CONTROL_PAGED ) or last;
  
  #$cookie    = $resp->cookie or last;             # delete
  $cookie = $resp->cookie;                         # add
  last if (!defined($cookie) || !length($cookie)); # add

  # Set cookie in paged control
  $page->cookie($cookie);
}

#if ($cookie) {                            # delete
if (defined($cookie) && length($cookie)) { # add

  # We had an abnormal exit, so let the server know we do not want any more
  $page->cookie($cookie);
  $page->size(0);
  $ldap->search( @args );
  # Also would be a good idea to die unhappily and inform OP at this point
     die("LDAP query unsuccessful");
}