Поиск в БД по LIKE с несколькими условиями

SELECT * FROM `table` WHERE istochnik='Источник1' and email LIKE '%@yandex.ru%' or email LIKE '%@mail.ru%'

if (isset($_REQUEST['base_creagram_2gis_exp'])){
unlink('export/base_creagram_domains_exp.csv');
if(isset($_POST['other'])){$other1 = '@mail.ru'; $other2 = '@bk.ru';$other3 = '@list.ru';$other4 = '@inbox.ru';$other5 = '@yandex.ru'; $other6 = '@gmail.com'; $other7 = '@rambler.ru';}
if(isset($_POST['mail'])){$mail = '@mail.ru'; $bk = '@bk.ru'; $list = '@list.ru'; $inbox = '@inbox.ru';} else {$mail = " ";$bk = " ";$list = " ";$inbox = " ";}
if(isset($_POST['yandex'])){$yandex= '@yandex.ru';} else {$yandex = " ";}
if(isset($_POST['google'])){$google = '@gmail.com';} else {$google = " ";}
if(isset($_POST['rambler'])){$rambler = '@rambler.ru';} else {$rambler = " ";}
$istoch = $_POST['istochnik'];
$istochnik = preg_replace('~(\r\n|\r|\n)~', "','", trim($istoch));
$sql = "SELECT * FROM table WHERE (email NOT LIKE '%$other1%' AND email NOT LIKE '%$other2%' AND email NOT LIKE '%$other3%' AND email NOT LIKE '%$other4%' AND email NOT LIKE '%$other5%' AND email NOT LIKE '%$other6%' AND email NOT LIKE '%$other7%' ) or (email LIKE '%$mail%' or email LIKE '%$bk%' or email LIKE '%$list%' or email LIKE '%$inbox%' or email LIKE '%$yandex%' or email LIKE '%$google%' or email LIKE '%$rambler%')";
$result = mysql_query($sql);
if ($result){while ($row = mysql_fetch_assoc($result)){                                       
$csv_file .= '"'.$row['email'].'";"'.$row['base'].'"'. "\r\n";
//echo "<table><tr><td>$csv_file </td><td></td></tr></table>";
}
$file_name = 'export/base_creagram_domains_exp.csv';
$file = fopen($file_name,"a+");
fwrite($file, iconv("utf-8", "windows-1251", $csv_file) . PHP_EOL);
fclose($file);
 
echo '<script>document.location.href = "./export/base_creagram_domains_exp.csv"; </script>';
 
 
}}

$sql = "SELECT * FROM table WHERE

if(!empty($_POST['istochnik']))
    $sql = '`base` = "' . $istochnik . '" AND ';
else
    $sql = '';

if($_POST['istochnik'] != "") {
    $sql = '`base` = "' . $istochnik . '" AND ';}
else
    {$sql = '';}

$sql = "SELECT * FROM table WHERE $sql ((email NOT LIKE...

if(!empty($_POST['istochnik'])){$sqlp = "base = '$istochnik' AND " ;} else {$sqlp = "";}