custom Fields on Account. Field Name : Gross Amount Type: Currency Fields on Opporutnity. Field Name: Amount Write a trigger on 'Opportunity' object. All related opportunities of Account should be rollup of Amount value(Opp) to Gross Amount(Acc) value on Account. once Gross Amount value will be updated on Account then mail should be fire to account owner.Please Note: Mail should be fire from trigger using apex code.
