diff --git a/notletters/exceptions.py b/notletters/exceptions.py
index 9e9ce91..a6bd237 100644
--- a/notletters/exceptions.py
+++ b/notletters/exceptions.py
@@ -12,34 +12,22 @@ class NotLettersAPIError(StollenAPIError, NotLettersError):
 class NotLettersBadRequestError(NotLettersAPIError):
     """400 Bad Request"""
 
-    message = "Bad request."
-
 
 class NotLettersUnauthorizedError(NotLettersAPIError):
     """401 Unauthorized"""
 
-    message = "Unauthorized."
-
 
 class NotLettersPaymentRequiredError(NotLettersAPIError):
     """402 Payment Required"""
 
-    message = "Payment required."
-
 
 class NotLettersForbiddenError(NotLettersAPIError):
     """403 Forbidden"""
 
-    message = "Forbidden."
-
 
 class NotLettersNotFoundError(NotLettersAPIError):
     """404 Not Found"""
 
-    message = "Resource not found."
-
 
 class NotLettersInternalServerError(NotLettersAPIError):
     """500 Internal Server Error"""
-
-    message = "Internal server error."