The campaign email notification no longer contains information on the count of emails sent/failed, here is another way to count how many emails were sent through campaigns:
1. List > Search > Saved Searches > New > select target group.
2. Criteria tab:
Campaign Response: Campaign ID is *ID number of your Marketing Campaign
3. Results tab:
- Field: Campaign Response: Event
- Summary Type: Group
- Field: Internal ID
- Summary: Count
4. Populate Search Title.
5. Click Save & Run.