diff --git a/rhodecode/model/forms.py b/rhodecode/model/forms.py
--- a/rhodecode/model/forms.py
+++ b/rhodecode/model/forms.py
@@ -299,3 +299,10 @@ def LdapSettingsForm(tls_reqcert_choices
         ldap_attr_email = v.UnicodeString(strip=True,)
 
     return _LdapSettingsForm
+
+
+def UserExtraEmailForm():
+    class _UserExtraEmailForm(formencode.Schema):
+        email = All(v.UniqSystemEmail(), v.Email)
+
+    return _UserExtraEmailForm
\ No newline at end of file