public override Task EnqueueForRetry(OutgoingMessageBatch batch) { Queued.AddRange(batch.Messages); Queued.RemoveAll(e => e.IsExpired()); if (Queued.Count > _settings.MaximumEnvelopeRetryStorage) { var toRemove = Queued.Count - _settings.MaximumEnvelopeRetryStorage; Queued = Queued.Skip(toRemove).ToList(); } return(Task.CompletedTask); }