We have two exchange 2013 servers setup in a DAG environment. we are not receiving some of the emails and when we checked the delivery report it shows the status as pending. we checked the queue in both the servers and it shows 0 emails in the queue.we don't know where the emails went if it has not been delivered and are in Pending status. Please help so we can retrieve the pending emails. Please check the below report.
Delivery Report for Receiver (receiver@domain.com)
Pending
31/08/2016 15:06 exchange1.domain.com The message has been transferred from exchange1.domain.com to EXCHANGE2.domain.com.
31/08/2016 16:53 exchange1.domain.com
No further information is available about this message because the logs are no longer available.