Fixing bug 159653.,

calendar/resources/content/calendarMail.js

@@ -183,6 +183,8 @@ function sendEvent()
 		// lets open a composer with fields and body prefilled
 		try
 		{
+         Event.alarm = false;
+         
          if(Event.method == 0)
              Event.method = Event.ICAL_METHOD_PUBLISH;
 			saveCalendarObject(CalendarDataFilePath, Event.getIcalString());