Fix error handling add core–constants

Author: Sergei Epatov

src/core/abstract/MCMessageConstants.h

@@ -253,6 +253,8 @@ namespace mailcore {
         ErrorServerDate,
         ErrorNoValidServerFound,
         ErrorCustomCommand,
+        ErrorSendMessageSpamSuspected,
+        ErrorSendMessageDailyLimitExceeded
     };
 
     enum PartType {