Mail flow in exchange 2013 and lotus domino coexistence

Question

scenario: Exchange 2013 CU3 running Windows 2012. coexsisting with lotus domino 8.5.1
there two cas server and two mailbox server. users migrated using quest tool. distribution groups are still lotus notes.
in one of distrbution group which containing around 5 users, 4 users are migrated to exchange 2013 cu3 one user still in lotus notes. the above mentioned distribution group members complaining they are not reciving mail which address to distribution group.
I used exchange shell for message tracking and I found below entries.
in source field the entry is mailboxrule i have verified there is no mail box rule in the user front
in eventid field the entry is receive
in the sourcehostname its show exchange 2013 server.
recipientstatus {unknown}
Since the distribution group is in lotus notes I want find event which sates that the message or exchange 2013 forwarding or checking the members of DL .
which field will give the required details currently i am finding anything.
please suggest

Answer 1

Thanks.
In current scenario we cant create any dl in the exchange 2013 front. I want to know what this mean
recipientstatus {unknown}.
secondly I have followed the link below
http://social.technet.microsoft.com/Forums/exchange/en-US/194c0bd8-9c77-4750-9f47-944451f2dd40/message-tracking-in-large-distribution-list-challenges-please-help?forum=exchangesvrgenerallegacy
I ran the below command:
Get-MessageTrackingLog -MessageSubject
"messageTrack" |select eventId, sender,@{l="recipeints";e={[string]($_.recipients)}}|ft
-Aut
oSize -Wrap
I am getting enventid, sender field details but recipeints field is empty.
Please suggest.