Tracking Outgoing emails in Exchange Sent Items folder using Server Side Sync

Hi,

I have actually configured Server Side Sync for one of my client and noticed during testing that when we send any email from Microsoft Dynamics CRM 2015 (On-Prem) web client or mobile client, it doesn’t appear in the user's mailbox (Exchange Web and Outlook) sent item but when we send any meeting request from CRM it appears in sent items and it also replicate with mailbox calendar.

Can anyone guide me how to enable so that the Outgoing emails from CRM also populate as sent items in their Outlook Sent Items folder?

Thank you,