In exchange 2013 sp1 SUBMITFAIL event id is happening

Hi ,

In exchange 2013 sp1 SUBMITFAIL event id is happening for some messages .But at the second time that the same message is delivered perfectly to the end users.

My question is simple ,is this an bug in exchange 2013 sp1 if so on which CU it will be corrected ?We have to update to our customers so all of us please provide your suggestions as soon as possible.

Thanks & Regards S.Nithyanandham