Duplicate Emails received from SQL Reports nightly

Hi All,

Exchange 2013, 2xCAS and 2xMBX DAG.

Client has nightly reports set up to send out from their SQL server using SP_dbsendmail. Since last Wed, they are getting duplicated items received to the members of their distribution lists from one particular job in SQL (at 7.45 am).

The message ID and received time are different (9 mins apart) across the duplicated emails however the client has checked the submission via SQL and only one email is being sent. The ShadowRedundancy feature is enabled.

Can you review the attached redacted headers ('original' email on the right and duplicated email on the left) to advise what may be happening?

Thanks in advance,

Pete MB