diff --git a/src/Egulias/EmailValidator/EmailLexer.php b/src/Egulias/EmailValidator/EmailLexer.php
index 3d5cd69..721190f 100644
--- a/src/Egulias/EmailValidator/EmailLexer.php
+++ b/src/Egulias/EmailValidator/EmailLexer.php
@@ -84,6 +84,7 @@ public function find($type)
         if (!$search->lookahead) {
             throw new \UnexpectedValueException($type . ' not found');
         }
+        return true;
     }
 
     /**
diff --git a/src/Egulias/EmailValidator/Parser/LocalPart.php b/src/Egulias/EmailValidator/Parser/LocalPart.php
index bd88583..47c7cc6 100644
--- a/src/Egulias/EmailValidator/Parser/LocalPart.php
+++ b/src/Egulias/EmailValidator/Parser/LocalPart.php
@@ -3,7 +3,6 @@
 namespace Egulias\EmailValidator\Parser;
 
 use Egulias\EmailValidator\EmailLexer;
-use Egulias\EmailValidator\Parser\Parser;
 use Egulias\EmailValidator\EmailValidator;
 
 
@@ -11,7 +10,9 @@ class LocalPart extends Parser
 {
     public function parse($localPart)
     {
+        $parseDQuote = true;
         $closingQuote = false;
+
         while ($this->lexer->token['type'] !== EmailLexer::S_AT && $this->lexer->token) {
 
             if ($this->lexer->token['type'] === EmailLexer::S_DOT && !$this->lexer->getPrevious()) {
@@ -19,6 +20,10 @@ public function parse($localPart)
             }
 
             $closingQuote = $this->checkDQUOTE($closingQuote);
+            if ($closingQuote && $parseDQuote) {
+                $this->parseDoubleQuote();
+                $parseDQuote = false;
+            }
 
             if ($this->lexer->token['type'] === EmailLexer::S_OPENPARENTHESIS) {
                 $this->parseComments();
@@ -26,20 +31,15 @@ public function parse($localPart)
 
             $this->checkConsecutiveDots();
 
-            if ($this->lexer->token['type'] === EmailLexer::S_DOT && $this->lexer->isNextToken(EmailLexer::S_AT)) {
+            if (
+                $this->lexer->token['type'] === EmailLexer::S_DOT &&
+                $this->lexer->isNextToken(EmailLexer::S_AT)
+            ) {
                 throw new \InvalidArgumentException('ERR_DOT_END');
             }
 
             $this->warnEscaping();
-
-            if ($this->lexer->isNextTokenAny(
-                array(
-                    EmailLexer::INVALID, EmailLexer::S_LOWERTHAN, EmailLexer::S_GREATERTHAN
-                )
-            )
-            ) {
-                throw new \InvalidArgumentException('ERR_EXPECTING_ATEXT');
-            }
+            $this->isInvalidToken($this->lexer->token, $closingQuote);
 
             if ($this->isFWS()) {
                 $this->parseFWS();
@@ -53,4 +53,42 @@ public function parse($localPart)
             $this->warnings[] = EmailValidator::RFC5322_LOCAL_TOOLONG;
         }
     }
+
+    protected function parseDoubleQuote()
+    {
+        $special = array (
+            EmailLexer::S_CR => true,
+            EmailLexer::S_HTAB => true,
+            EmailLexer::S_LF => true
+        );
+        $setSpecialsWarning = true;
+
+        $this->lexer->moveNext();
+        while ($this->lexer->token['type'] !== EmailLexer::S_DQUOTE && $this->lexer->token) {
+            if (isset($special[$this->lexer->token['type']]) && $setSpecialsWarning) {
+                $this->warnings[] = EmailValidator::CFWS_FWS;
+                $setSpecialsWarning = false;
+            }
+            $this->lexer->moveNext();
+        }
+    }
+
+
+    protected function isInvalidToken($token, $closingQuote)
+    {
+        $forbidden = array(
+            EmailLexer::S_COMMA,
+            EmailLexer::S_CLOSEBRACKET,
+            EmailLexer::S_OPENBRACKET,
+            EmailLexer::S_GREATERTHAN,
+            EmailLexer::S_LOWERTHAN,
+            EmailLexer::S_COLON,
+            EmailLexer::S_SEMICOLON,
+            EmailLexer::INVALID
+        );
+
+        if (in_array($token['type'], $forbidden) && !$closingQuote) {
+            throw new \InvalidArgumentException('ERR_EXPECTING_ATEXT');
+        }
+    }
 }
diff --git a/src/Egulias/EmailValidator/Parser/Parser.php b/src/Egulias/EmailValidator/Parser/Parser.php
index 3f4b3e3..b62b405 100644
--- a/src/Egulias/EmailValidator/Parser/Parser.php
+++ b/src/Egulias/EmailValidator/Parser/Parser.php
@@ -102,6 +102,10 @@ protected function checkConsecutiveDots()
 
     protected function isFWS()
     {
+        if ($this->escaped()) {
+            return false;
+        }
+
         if ($this->lexer->token['type'] === EmailLexer::S_SP ||
             $this->lexer->token['type'] === EmailLexer::S_HTAB ||
             $this->lexer->token['type'] === EmailLexer::S_CR ||
@@ -114,6 +118,21 @@ protected function isFWS()
         return false;
     }
 
+    protected function escaped()
+    {
+        $previous = $this->lexer->getPrevious();
+
+        if ($previous['type'] === EmailLexer::S_BACKSLASH
+            &&
+            ($this->lexer->token['type'] === EmailLexer::S_SP ||
+            $this->lexer->token['type'] === EmailLexer::S_HTAB)
+        ) {
+            return true;
+        }
+
+        return false;
+    }
+
     protected function warnEscaping()
     {
         if ($this->lexer->token['type'] !== EmailLexer::S_BACKSLASH) {
diff --git a/tests/egulias/Tests/EmailValidator/EmailLexerTest.php b/tests/egulias/Tests/EmailValidator/EmailLexerTest.php
index 27f3d68..5ee3f3e 100644
--- a/tests/egulias/Tests/EmailValidator/EmailLexerTest.php
+++ b/tests/egulias/Tests/EmailValidator/EmailLexerTest.php
@@ -36,6 +36,14 @@ public function testLexerForTab()
         $this->assertEquals(EmailLexer::S_HTAB, $lexer->token['type']);
     }
 
+    public function testLexerSearchToken()
+    {
+        $lexer = new EmailLexer();
+        $lexer->setInput("foo\tbar");
+        $lexer->moveNext();
+        $this->assertTrue($lexer->find(EmailLexer::S_HTAB));
+    }
+
     public function getTokens()
     {
         return array(
diff --git a/tests/egulias/Tests/EmailValidator/EmailValidatorTest.php b/tests/egulias/Tests/EmailValidator/EmailValidatorTest.php
index c279157..81fcf4d 100644
--- a/tests/egulias/Tests/EmailValidator/EmailValidatorTest.php
+++ b/tests/egulias/Tests/EmailValidator/EmailValidatorTest.php
@@ -34,11 +34,15 @@ public function getValidEmails()
             array('fabien_potencier@example.fr'),
             array('example@localhost'),
             array('fab\'ien@symfony.com'),
+            array('fab\ ien@symfony.com'),
             array('example((example))@fakedfake.co.uk'),
             array('example@faked(fake).co.uk'),
             array('fabien+@symfony.com'),
             array('инфо@письмо.рф'),
-
+            array('"username"@example.com'),
+            array('"user,name"@example.com'),
+            array('"user name"@example.com'),
+            array('"user@name"@example.com'),
         );
     }
 
@@ -66,6 +70,8 @@ public function getInvalidEmails()
             array('example@(fake).com'),
             array('example@(fake.com'),
             array('username@example,com'),
+            array('usern,ame@example.com'),
+            array('user[na]me@example.com'),
         );
     }
 
@@ -105,14 +111,13 @@ public function getInvalidEmailsWithErrors()
             array(EmailValidator::ERR_CR_NO_LF, "example@exa\rmple.co.uk"),
             array(EmailValidator::ERR_CR_NO_LF, "example@[\r]"),
             array(EmailValidator::ERR_CR_NO_LF, "exam\rple@example.co.uk"),
-            array(EmailValidator::ERR_CR_NO_LF, "\"\r\"@localhost"),
         );
     }
 
     /**
      * @dataProvider getInvalidEmailsWithWarnings
      */
-    public function testInvalidEmailsWithWarningsCheck($warnings, $email)
+    public function testValidEmailsWithWarningsCheck($warnings, $email)
     {
         $this->assertTrue($this->validator->isValid($email, true));
 
@@ -139,6 +144,13 @@ public function getInvalidEmailsWithWarnings()
                 ),
                 "\"\t\"@example.co.uk"
             ),
+            array(
+                array(
+                    EmailValidator::RFC5321_QUOTEDSTRING,
+                    EmailValidator::CFWS_FWS,
+                ),
+                "\"\r\"@example.co.uk"
+            ),
             array(
                 array(
                     EmailValidator::RFC5321_ADDRESSLITERAL,