If anybody delete my record from "Dipendenti__c" send notification to that mail.
In this code mail is not sending.
Please verify the code

trigger mailDelDip on Dipendente__c (before delete) {
    Messaging.reserveSingleEmailCapacity(trigger.size);
    List<Messaging.SingleEmailMessage> emails = new List<Messaging.SingleEmailMessage>();
    for (Dipendente__c dip : Trigger.old){
    
    Messaging.SingleEmailMessage email = new Messaging.SingleEmailMessage(); 
    email.setToAddresses(new String[] {'montorselli.daniele@gmail.com'}); 
    email.setSubject('Automated email: dipendente eliminato');    
    email.setPlainTextBody('Attenzione è stato cancellato un dipendente');
    emails.add(email);         
        }
    Messaging.sendEmail(emails);
    for (Dipendente__c dip : Trigger.old){
        dip.addError('Unable to delete record!');
    }
    }