about MAPIHandler

hi all, we are facing one problem thart. the mails not sending from the ERP software. when we trying to detect the fault. we find that the mistake will done at "MAPIHandler.SEND " method. how can we know what is tasks done at that method. actually we use that method usindg automation varaible in NAVISION and we assign “NAVISION ATTAIN APPLICATION HANDLER”. Now my question is " is there any chance to modify(or) trace the internal working,(or) code of the 'MAPIHadler.SEND ’ method.

isn’t the same problem in http://dynamicsuser.net/forums/t/20214.aspx ?