Hello All,

Below apex class sends email to the specific contacts on a monthly basis.I want to know if there is any email bounce due to incorrect email.I have updated the settings in Email Deliverability to return the bounced emails to sender.However it is not working i.e., I don't get any email if I provide invalid email.Is there any way to know for which contacts the email is not delivered.I don't want to use email logs as the requirement is to update a date field on contact whenever email is delivered successfully.

Global class SendEmailToAccount implements Schedulable
{

   global void execute(SchedulableContext sc)
    {
                sendmail();
    }
 
    public void sendmail()
    {// Get default sender email address   
        OrgWideEmailAddress owa = [select id, DisplayName, Address from OrgWideEmailAddress where DisplayName='Sender' limit 1];
      //Get Email Template
        EmailTemplate templateId = [Select id from EmailTemplate where name = 'TemplateName'];
        
       List<Messaging.SingleEmailMessage> allmsg = new List<Messaging.SingleEmailMessage>();
       Set<Id> cid= new Set<id>();
       List<Account> accList = [select Id,primary_contact__c from Account where RecordType.developerName = 'My_Account_Record_Type'];
       List<Messaging.SendEmailResult> results;
       
       for(account acc:accList)
       {
            Messaging.SingleEmailMessage mail = new Messaging.SingleEmailMessage();
            mail.setTemplateID(templateId.Id); 
            mail.setSaveAsActivity(false);    
            mail.setTargetObjectId(acc.Primary_Contact__c);
            mail.setWhatId(acc.Id);
            mail.setOrgWideEmailAddressId(owa.id);
            allmsg.add(mail);
            
       }
     
        if(allmsg.size()>0)
        {
              
              results =  Messaging.sendEmail(allmsg,false);
         }
        if (!results.get(0).isSuccess()) 
        {
            
            System.StatusCode statusCode = results.get(0).getErrors()[0].getStatusCode();
            String errorMessage = results.get(0).getErrors()[0].getMessage();
            system.debug(errorMessage);
        }
     }                                     
}