diff --git a/rhodecode/lib/rcmail/exceptions.py b/rhodecode/lib/rcmail/exceptions.py
--- a/rhodecode/lib/rcmail/exceptions.py
+++ b/rhodecode/lib/rcmail/exceptions.py
@@ -1,3 +1,4 @@
+
 
 class InvalidMessage(RuntimeError):
     """
@@ -5,6 +6,7 @@ class InvalidMessage(RuntimeError):
     as recipients or sender address.
     """
 
+
 class BadHeaders(RuntimeError):
     """
     Raised if message contains newlines in headers.