diff --git a/CHANGES.txt b/CHANGES.txt
index 75fb68d..b82b655 100644
--- a/CHANGES.txt
+++ b/CHANGES.txt
@@ -1,7 +1,7 @@
 Next release
 ------------
 
-- ....
+- Loosen Email validator regex (permit apostrophes, bang, etc in localpart).
 
 1.0a3 (2013-05-16)
 ------------------
diff --git a/colander/__init__.py b/colander/__init__.py
index 5c81cc0..ae28ea0 100644
--- a/colander/__init__.py
+++ b/colander/__init__.py
@@ -275,14 +275,16 @@ class Regex(object):
         if self.match_object.match(value) is None:
             raise Invalid(node, self.msg)
 
+EMAIL_RE = "(?i)^[A-Z0-9._%!#$%&'*+-/=?^_`{|}~()]+@[A-Z0-9]+([.-][A-Z0-9]+)*\.[A-Z]{2,8}$"
+
 class Email(Regex):
     """ Email address validator. If ``msg`` is supplied, it will be
         the error message to be used when raising :exc:`colander.Invalid`;
         otherwise, defaults to 'Invalid email address'.
     """
+    
     def __init__(self, msg=None):
-        email_regex = text_(
-            '(?i)^[A-Z0-9._%+-]+@[A-Z0-9]+([.-][A-Z0-9]+)*\.[A-Z]{2,4}$')
+        email_regex = text_(EMAIL_RE)
         if msg is None:
             msg = _("Invalid email address")
         super(Email, self).__init__(email_regex, msg=msg)
diff --git a/colander/tests/test_colander.py b/colander/tests/test_colander.py
index a76ebef..da9e309 100644
--- a/colander/tests/test_colander.py
+++ b/colander/tests/test_colander.py
@@ -349,6 +349,7 @@ class TestEmail(unittest.TestCase):
         self.assertEqual(validator(None, 'name@here1.us'), None)
         self.assertEqual(validator(None, 'name@here1.info'), None)
         self.assertEqual(validator(None, 'foo@bar.baz.biz'), None)
+        self.assertEqual(validator(None, "tip'oneill@house.gov"), None)
 
     def test_empty_email(self):
         validator = self._makeOne()
@@ -359,9 +360,8 @@ class TestEmail(unittest.TestCase):
         validator = self._makeOne()
         from colander import Invalid
         self.assertRaises(Invalid, validator, None, 'me@here.')
-        self.assertRaises(Invalid, validator, None, 'name@here.comcom')
+        self.assertRaises(Invalid, validator, None, 'name@here.tldiswaytoolong')
         self.assertRaises(Invalid, validator, None, '@here.us')
-        self.assertRaises(Invalid, validator, None, '(name)@here.info')
         self.assertRaises(Invalid, validator, None, 'me@here..com')
         self.assertRaises(Invalid, validator, None, 'me@we-here-.com')