The subject line is automatically included when you use a custom Campaign Performance Report. Here’s how to set it up to analyze your open rates for last month’s campaigns:

1. Go to Analytics > Custom Reports and click the Create from Scratch button.
2. In the Report Type drop-down, select the Campaign Performance Report.
3. Click the Standard Campaign Metrics drop-down and remove the irrelevant metrics. At minimum, you’ll want to look at Email Open Rate, but I would also keep Email Recipients and Unique Opens Email so you can compare the raw numbers when you send to varying segment sizes.
4. Under Group By, choose Campaigns, or Campaigns (including variations) if you’ve been running A/B tests. Optionally, you can add List/Segment if you send campaigns to multiple segments and want to compare.
5. Under Timeframe, choose Sent Last Month.
6. Click the Save & Run Report button.
7. Scroll down to see the results.

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