The Delivery Service cannot guarantee that application messages will arrive in order within the same epoch. To address this, applications can configure the out_of_order_tolerance parameter of the SenderRatchetConfiguration. The configuration can be set as the sender_ratchet_configuration parameter of the MlsGroupCreateConfig

In some cases, a causal de-livery algorithm additionally ensures that when one updatehas a dependency on an earlier update, the earlier update isdelivered before the later update on all replicas