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When an Account is restored from the Recycle Bin (after undelete), append " - Restored" to its Name and send a notification to the System Admin.

DevelopmentMediumInfosysAccentureBirlasoft

In after undelete, Trigger.new is read-only, so create new SObject instances with the Id (or re-query) and update them. Then notify an admin.

apex
trigger AccountTrigger on Account (after undelete) {
    List<Account> toUpdate = new List<Account>();
    for (Account a : Trigger.new) toUpdate.add(new Account(Id = a.Id, Name = a.Name + ' - Restored'));
    update toUpdate;
    User admin = [SELECT Email FROM User WHERE Profile.Name = 'System Administrator' AND IsActive = true LIMIT 1];
    Messaging.SingleEmailMessage m = new Messaging.SingleEmailMessage();
    m.setToAddresses(new String[]{ admin.Email });
    m.setSubject('Accounts restored');
    m.setPlainTextBody(toUpdate.size() + ' Account(s) restored from the Recycle Bin.');
    Messaging.sendEmail(new Messaging.SingleEmailMessage[]{ m });
}

Use a custom notification or Chatter post if email isn't preferred.

apex-triggertriggercodingscenarioundelete

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