caseObject.Email_Reply__c = 'replied yesterday';

                    }
                    else if(caseObject.EmailMessages[0].CreatedDate >= Date.today().addDays(-7)) {

                        caseObject.Email_Reply__c = 'replied  this week';
                    }

                    else {
                        caseObject.Email_Reply__c = 'replied this month';

                    }
                }
            }
            update caseList;
            System.debug('updated email:::' +caseList);
        }
    }
    catch(Exception exc){
        System.debug('Exception:>>>>'  +exc.getMessage()+  '<<<---line numberr>>>' +exc.getLineNumber());
    }

}