Good day Bhabani,
You could use Dynamics 365 App for Outlook to help you track mails activities from Outlook Client to Dynamics then you don't need to send mails from Dynamics CE end.
For example, when you open an email message, view information from your Dynamics 365 app about the email recipients. Or with a single click, link an Outlook email message or appointment to a specific Dynamics 365 record. When you link an email message or appointment to a Dynamics 365 record, the Outlook record appears as an activity for that record in Dynamics 365 apps.
I would recommend following App for Outlook User Guide for your reference:
docs.microsoft.com/.../dynamics-365-app-outlook-user-s-guide
Please follow up if there's any question regarding this. Thanks.
Regards
Johnny