I have trigger the below simple trigger to add BCC address dynamically, but its not firing to email. It is showing in the debug log about the added email address . Please help to solve this. 
 

trigger EmailMessage_Trigger on EmailMessage (before insert) {
    
       // EmailMessage_Trigger_Helper.emailMessage(Trigger.New);
     
     for(EmailMessage emsg : Trigger.New){
         if (emsg.Incoming==false && emsg.Status == '3') 
         {
             emsg.BccAddress ='saiprasanth123@gmail.com';  
             emsg.CcAddress ='saiprasanth1234@gmail.com';
           system.debug('coming sai inside:'+emsg.CcAddress+'....'+emsg.FromAddress);

         }
           system.debug('coming sai outside:'+emsg);
     }
}

Thanks,
Sai.