Hi Sudhakar,
There is no standard functionality for e-AD notification.
It would be best to cover this with a business process, to monitor the Export Confirmations in the system, using Transaction /SAPSLL/REPA_CUS. When the confirmations have not been received within a reasonable time, the Customs Administrator should chase, just as they would do if the e-mail was issued.
It's possible to set a variant including a filter, so that only Declarations with a Customs Registration number are shown in the results list.
Hope that helps.
Regards,
Dave