You can't have duplicate emails.
Here: (I wrote this a LONG time ago...)
<?phprequire 'Settings.php';require $sourcedir . '/Subs.php';require $sourcedir . '/Load.php';require $sourcedir . '/Errors.php';$dbcon = mysql_connect ($db_server, $db_user, $db_passwd);mysql_select_db ($db_name);LoadCookie();LoadUserSettings();$modSettings = array();$request = mysql_query(" SELECT variable, value FROM {$db_prefix}settings WHERE variable != 'agreement'") or database_error(__FILE__, __LINE__);while ($row = mysql_fetch_assoc($request)) $modSettings[$row['variable']] = $row['value'];$chklngfile = $chklngfile2 = $settings[23];if ($modSettings['userLanguage'] == 1){ if ($chklngfile == Null) include_once($language); else include_once($chklngfile2);}else include_once($language);Duplicates();function Duplicates(){ global $db_prefix, $scripturl, $color, $yytitle; $yytitle = 'Duplicates'; template_header(); $q = mysql_query(" SELECT DISTINCT m.memberIP AS ip, m.memberName AS user, m.realName AS name FROM {$db_prefix}members AS m, {$db_prefix}members AS m2 WHERE m.memberIP = m2.memberIP AND m.ID_MEMBER != m2.ID_MEMBER ORDER BY m.memberIP, m.memberName") or database_error(__FILE__, __LINE__); $q2 = mysql_query(" SELECT posts, memberName AS name FROM {$db_prefix}members"); $r2 = mysql_fetch_table($q2, 'name', 'posts'); $colors[0] = $color['windowbg']; $colors[1] = $color['windowbg2']; $i = 1; if ($r = mysql_num_rows($q)) { echo ' <table cellspacing="0" cellpadding="0" width="100%">'; while($r = mysql_fetch_assoc($q)) { if ($r['ip'] != $lastip) $i = $i ^ 1; $lastip = $r['ip']; echo ' <tr bgcolor="' . $colors[$i] . '"> <td><a href="' . $scripturl . '?action=viewprofile&user=' . $r['user'] . '">' . $r['name'] . '</a> (' . $r['user'] . ') with ' . $r2[$r['user']] . ' posts.</td> <td align="right"><a href="http://www.nic.com/cgi-bin/whois.cgi?query=' . $r['ip'] . '">' . $r['ip'] . '</td> </tr>'; } echo ' </table>'; } footer(); obExit();}function mysql_fetch_table($query = '', $idname = '', $selname = '', $call = ''){ assert_options(ASSERT_ACTIVE, 1); assert_options(ASSERT_WARNING, 1); assert($query != ''); while($row = mysql_fetch_assoc($query)) { if($selname == '') { if($idname == '') $rows[] = (($call == '') ? ($row) : ($call($row))); else $rows[$row[$idname]] = (($call == '') ? ($row) : ($call($row))); } else { if($idname == '') $rows[] = (($call == '') ? ($row[$selname]) : ($call($row[$selname]))); else $rows[$row[$idname]] = (($call == '') ? ($row[$selname]) : ($call($row[$selname]))); } } return $rows;}?>
-[Unknown]