This is using ms exchange 2013. A user reported that he sent 2 mails this morning. The emails were sent out and the recipient was received. However, the user can find these 2 sent mails in the "sent" folder of his MS Outlook.
We already checked that these 2 emails not dropping in his "sent" folder in owa as well. What could be the reason why mails can't find in the sent folder?