Exchange 2013 resubmit mails

HI all,

Experiencing issue With Exchange 2013 environment ( 2 servers With cas and mailbox role With DAG)where some of Our emails are beeing resubmitted.

So far cant see any pattern on why or where it sends Message twice to a recepient.

Any idea where i can start to troubleshoot or what that might cause this?

thanks!

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