Hi pavan,
If you have added failure or successful message and mail recipients in your process chains, recepients would get mail notification upon completion of that step..if recepients not getting the mails, check the configuration of recepients in SCOT t- code..or check the mail ids which you gave in process chains..mail id should have correct format and recepient type should be Internet... And finally check the SOST t-code to check the messages which are stuck...
BR,
Venu