Hi Vamsi,
Which mechanism you have used for development...Old Alert Configuration (recommend for 7.0/7.1) or Component-Based Message Alerting (7.31)..
For CBMA method you have define the group lin ABAP stack using S023 define the list and assign the alert rule which you have created in ID.
Than set the BG job based on your frequency using SM36
SXMSALERT_SEND_VIA_MAIL
After run the above job check the status in SOST...
Thanks,
Naveen.