diff --git a/src/Storage.php b/src/Storage.php
index 21106fb..3028fdd 100644
--- a/src/Storage.php
+++ b/src/Storage.php
@@ -4,45 +4,45 @@ namespace Ely\TempMailBuster;
 class Storage
 {
     /**
-     * @var array of string, which contains masks for temp mail services
+     * @var array of strings, which contains masks for temp mail services
      */
-    private $blacklist;
+    private $items;
 
     /**
-     * @param array $blacklist
+     * @param array $items
      */
-    public function __construct(array $blacklist = [])
+    public function __construct(array $items = [])
     {
-        $this->blacklist = $blacklist;
+        $this->items = $items;
     }
 
     /**
-     * @return array with current blacklist
+     * @return array with current items
      */
-    public function getBlacklist()
+    public function getItems()
     {
-        return $this->blacklist;
+        return $this->items;
     }
 
     /**
-     * @param string|array $items item or items, that will be merged to blacklist
+     * @param array $items override current items with passed values
      * @return static
      */
-    public function appendToBlacklist($items)
+    public function setItems(array $items)
     {
-        $items = (array)$items;
-        $this->blacklist = array_merge($this->blacklist, $items);
-
+        $this->items = $items;
         return $this;
     }
 
     /**
-     * @param array $items override current blacklist with passed values
+     * @param string|array $items item or items, that will be merged to items
      * @return static
      */
-    public function setBlacklist(array $items)
+    public function append($items)
     {
-        $this->blacklist = $items;
+        $items = (array)$items;
+        $this->items = array_merge($this->items, $items);
+
         return $this;
     }
 }
diff --git a/src/TempMailBuster.php b/src/TempMailBuster.php
index 14e9ffa..90fa9b5 100644
--- a/src/TempMailBuster.php
+++ b/src/TempMailBuster.php
@@ -6,22 +6,23 @@ class TempMailBuster
     /**
      * @var Storage
      */
-    private $storage;
+    private $primaryStorage;
+    /**
+     * @var Storage|null
+     */
+    private $secondaryStorage;
+    /**
+     * @var bool
+     */
+    private $isWhitelistMode = false;
 
     /**
      * @param Storage $storage
      */
-    public function __construct(Storage $storage)
+    public function __construct(Storage $primaryStorage, Storage $secondaryStorage = null)
     {
-        $this->storage = $storage;
-    }
-
-    /**
-     * @return Storage
-     */
-    public function getStorage()
-    {
-        return $this->storage;
+        $this->primaryStorage = $primaryStorage;
+        $this->secondaryStorage = $secondaryStorage;
     }
 
     /**
@@ -35,12 +36,85 @@ class TempMailBuster
     public function validate($email)
     {
         $domain = $this->getDomain($email);
-        $tempMailsRegex = $this->buildRegex($this->getStorage()->getBlacklist());
-        $match = preg_match($tempMailsRegex, $domain);
+        $secondaryStorage = $this->secondaryStorage;
+        if ($secondaryStorage === null) {
+            $secondaryStorage = new Storage();
+        }
 
-        // TODO: add support for whitelists
+        if (!$this->isWhitelistMode) {
+            $blacklist = $this->primaryStorage;
+            $whitelist = $secondaryStorage;
+        } else {
+            $blacklist = $secondaryStorage;
+            $whitelist = $this->primaryStorage;
+        }
 
-        return !$match;
+        $blacklistRegex = $this->buildRegex($blacklist->getItems());
+        $match = !!preg_match($blacklistRegex, $domain);
+        if ($match == $this->isWhitelistMode) {
+            return !$this->isWhitelistMode;
+        }
+
+        $whitelistRegex = $this->buildRegex($whitelist->getItems());
+        $match = !!preg_match($whitelistRegex, $domain);
+
+        return $match;
+    }
+
+    /**
+     * @return Storage
+     */
+    public function getPrimaryStorage()
+    {
+        return $this->primaryStorage;
+    }
+
+    /**
+     * @param Storage $primaryStorage
+     * @return static
+     */
+    public function setPrimaryStorage(Storage $primaryStorage)
+    {
+        $this->primaryStorage = $primaryStorage;
+        return $this;
+    }
+
+    /**
+     * @return Storage|null
+     */
+    public function getSecondaryStorage()
+    {
+        return $this->secondaryStorage;
+    }
+
+    /**
+     * @param Storage|null $secondaryStorage
+     * @return static
+     */
+    public function setSecondaryStorage(Storage $secondaryStorage = null)
+    {
+        $this->secondaryStorage = $secondaryStorage;
+        return $this;
+    }
+
+    /**
+     * @return bool is enabled whitelist mode
+     */
+    public function isIsWhitelistMode()
+    {
+        return $this->isWhitelistMode;
+    }
+
+    /**
+     * Switching validator working mode
+     *
+     * @param bool $enable
+     * @return static
+     */
+    public function whitelistMode($enable = true)
+    {
+        $this->isWhitelistMode = $enable;
+        return $this;
     }
 
     /**
diff --git a/tests/StorageTest.php b/tests/StorageTest.php
index 30fa9e9..eea4466 100644
--- a/tests/StorageTest.php
+++ b/tests/StorageTest.php
@@ -3,27 +3,27 @@ namespace Ely\TempMailBuster;
 
 class StorageTest extends \PHPUnit_Framework_TestCase
 {
-    public function testGetBlackList()
+    public function testGetItems()
     {
         $storage = new Storage(['item']);
-        $this->assertEquals(['item'], $storage->getBlacklist());
+        $this->assertEquals(['item'], $storage->getItems());
     }
 
-    public function testAppendToBlacklist()
+    public function testAppend()
     {
         $storage = new Storage(['item1']);
-        $this->assertEquals($storage, $storage->appendToBlacklist(['item2']));
-        $this->assertEquals(['item1', 'item2'], $storage->getBlacklist());
+        $this->assertEquals($storage, $storage->append(['item2']));
+        $this->assertEquals(['item1', 'item2'], $storage->getItems());
 
         $storage = new Storage(['item1']);
-        $this->assertEquals($storage, $storage->appendToBlacklist('item2'));
-        $this->assertEquals(['item1', 'item2'], $storage->getBlacklist());
+        $this->assertEquals($storage, $storage->append('item2'));
+        $this->assertEquals(['item1', 'item2'], $storage->getItems());
     }
 
-    public function testSetBlacklist()
+    public function testSetItems()
     {
         $storage = new Storage(['item1']);
-        $this->assertEquals($storage, $storage->setBlacklist(['item2']));
-        $this->assertEquals(['item2'], $storage->getBlacklist());
+        $this->assertEquals($storage, $storage->setItems(['item2']));
+        $this->assertEquals(['item2'], $storage->getItems());
     }
 }
diff --git a/tests/TempMailBusterTest.php b/tests/TempMailBusterTest.php
index 54355e4..a403097 100644
--- a/tests/TempMailBusterTest.php
+++ b/tests/TempMailBusterTest.php
@@ -3,11 +3,70 @@ namespace Ely\TempMailBuster;
 
 class TempMailBusterTest extends \PHPUnit_Framework_TestCase
 {
-    public function testGetStorage()
+    public function testValidate()
+    {
+        $object = new TempMailBuster(new Storage());
+        $this->assertTrue($object->validate('notch@mojang.com'));
+
+        $object = new TempMailBuster(new Storage());
+        $object->whitelistMode();
+        $this->assertFalse($object->validate('notch@mojang.com'));
+
+        $object = new TempMailBuster(new Storage(['mojang\.com']));
+        $this->assertFalse($object->validate('notch@mojang.com'));
+        $this->assertTrue($object->validate('erickskrauch@ely.by'));
+
+        $object = new TempMailBuster(new Storage(['gmail\.com']));
+        $object->whitelistMode();
+        $this->assertFalse($object->validate('team@ely.by'));
+        $this->assertTrue($object->validate('erickskrauch@gmail.com'));
+
+        $object = new TempMailBuster(new Storage(['mojang\.com', 'ely\.by']), new Storage(['ely\.by']));
+        $this->assertFalse($object->validate('notch@mojang.com'));
+        $this->assertTrue($object->validate('team@ely.by'));
+
+        $object = new TempMailBuster(new Storage(['gmail\.com', 'mail\.ru']), new Storage(['mail\.ru']));
+        $object->whitelistMode();
+        $this->assertTrue($object->validate('erickskrauch@gmail.com'));
+        $this->assertFalse($object->validate('random@mail.ru'));
+    }
+
+    public function testGetPrimaryStorage()
     {
         $storage = new Storage(['test']);
         $object = new TempMailBuster($storage);
-        $this->assertEquals($storage, $object->getStorage());
+        $this->assertEquals($storage, $object->getPrimaryStorage());
+    }
+
+    public function testSetPrimaryStorage()
+    {
+        $storage = new Storage(['test2']);
+        $object = new TempMailBuster(new Storage(['test1']));
+        $this->assertEquals($object, $object->setPrimaryStorage($storage));
+        $this->assertEquals($storage, $object->getPrimaryStorage());
+    }
+
+    public function testGetSecondaryStorage()
+    {
+        $object = new TempMailBuster(new Storage());
+        $this->assertNull($object->getSecondaryStorage());
+
+        $storage = new Storage(['test']);
+        $object = new TempMailBuster(new Storage(), $storage);
+        $this->assertEquals($storage, $object->getSecondaryStorage());
+    }
+
+    public function testSetSecondaryStorage()
+    {
+        $storage = new Storage(['test2']);
+        $object = new TempMailBuster(new Storage());
+        $this->assertEquals($object, $object->setSecondaryStorage($storage));
+        $this->assertEquals($storage, $object->getSecondaryStorage());
+        $object->setSecondaryStorage(null);
+        $this->assertNull($object->getSecondaryStorage(), 'Set by null should work');
+        $object->setSecondaryStorage($storage);
+        $object->setSecondaryStorage();
+        $this->assertNull($object->getSecondaryStorage(), 'Set by empty value should work');
     }
 
     public function testGetDomain()
@@ -18,6 +77,25 @@ class TempMailBusterTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('ely.by', $this->callGetDomain($object, 'ely.by'));
     }
 
+    public function testIsIsWhitelistMode()
+    {
+        $object = new TempMailBuster(new Storage());
+        $this->assertFalse($object->isIsWhitelistMode(), 'Default should be false');
+        $object->whitelistMode();
+        $this->assertTrue($object->isIsWhitelistMode());
+    }
+
+    public function testWhitelistMode()
+    {
+        $object = new TempMailBuster(new Storage());
+        $this->assertEquals($object, $object->whitelistMode());
+        $this->assertTrue($object->isIsWhitelistMode(), 'Default value should change mode to whitelist');
+        $object->whitelistMode(false);
+        $this->assertFalse($object->isIsWhitelistMode());
+        $object->whitelistMode(true);
+        $this->assertTrue($object->isIsWhitelistMode());
+    }
+
     public function testBuildRegex()
     {
         $object = new TempMailBuster(new Storage());
@@ -25,15 +103,6 @@ class TempMailBusterTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('/^(simple|another)$/', $this->callBuildRegex($object, ['simple', 'another']));
     }
 
-    public function testValidate()
-    {
-        $storage = new Storage(['mojang\.com']);
-        $object = new TempMailBuster($storage);
-        $this->assertFalse($object->validate('notch@mojang.com'));
-        $this->assertTrue($object->validate('jeb@mojang1.com'));
-        $this->assertTrue($object->validate('erickskrauch@ely.by'));
-    }
-
     private function callGetDomain($object, $email)
     {
         $class = new \ReflectionClass($object);