Delivery Event Details

Hello, The sender's authentication type in delivery event details show dovecot_login, forwarder and localdelivery, what does mean each one of them ? and is there other type? Same thing in the Transport there is dovecot_virtual_delivery, dkim_remote_smtp and dovecot_virtual_delivery_no_batch I would like to know what each type mean and is there other types ? Regards Qasem