Local part of the email address should be less or equal than 64 bytes. (#147)

Author: mondeja

tests/test_email.py

@@ -34,6 +34,7 @@ def test_returns_true_on_valid_email(value, whitelist):
     ('example@-invalid.com',),
     ('example@inv-.alid-.com',),
     ('example@inv-.-alid.com',),
+    ('john56789.john56789.john56789.john56789.john56789.john56789.john5@example.com',),
     # Quoted-string format (CR not allowed)
     ('"\\\012"@here.com',),
 ])

validators/email.py

@@ -61,6 +61,9 @@ def email(value, whitelist=None):
 
     if not user_regex.match(user_part):
         return False
+        
+    if len(user_part.encode("utf-8")) > 64:
+        return False
 
     if domain_part not in whitelist and not domain_regex.match(domain_part):
         # Try for possible IDN domain-part