When you say the activity logged is not syncing to Opportunity, are you referring to the Opportunity's Activity History, or do you have the Sales Insight section on your Opportunities? Could you post a screenshot or two to explain?
I suspect that the Opp record doesn't have the Contact Role of the Contact receiving the email.
It also depends heavily on how well the rep uses Sales Insight and Outlook..
Grant's right, of course, we need to see more here.
Thanks for the input! I am referring to the Activity History. The contact is listed on the Opportunity, but isn't listed as primary or with a role. Here's a few screenshots showing the activity history logged on the Account, but missing on the Opportunity.
Contact role listed on opportunity: