Actually, you can track open rates through Infusion CRM. Here are the steps.
1. Send a batch email (be sure to send an HTML email since open rates can't be tracked in plain text) and make sure you select "Track Opened Rates"

2. After the batch has completed, go to Marketing -> Marketing Reports -> Email Batch Status
3. Click on "View" next to the batch email you'd like to look at.
4. You'll see a graph called "Delivery Report" showing number of emails bounced, skipped, and delivered.
5. Click on "delivered" and it will open another graph showing "opened", "opened and clicked", or "nothing".
