+ /**
+ * Tries to lookup user by given email address. If the user is not found a
+ * proper exceptions is thrown.
+ * <p>
+ * @param emailAddress Email address
+ * <p>
+ * @return User instance
+ * <p>
+ * @throws UserEmailAddressNotFoundException If the user's email address is not found
+ */
+ User lookupUserByEmailAddress (final String emailAddress) throws UserEmailAddressNotFoundException;
+