To test different subject lines with a pilot group and then send the winning subject line out to the remaining customers, you should place a random split before path optimizer for the pilot group. This will allow you to divide your audience into two groups: one for testing and one for holding back. Then, you can use path optimizer to test up to 10 subject lines with the testing group and select the winner based on open rate or click rate. Finally, you can send the winning subject line to the holdback group.

Creating folders in My Tracking and selecting where to send results when sending an email is the best way to help organize NTO's email tracking results. This way, NTO can group their email campaigns by different criteria, such as date, topic, audience, etc., and easily find the results they need. Giving emails unique names is also helpful, but it does not provide a way to categorize them. Removing old tracking results may declutter the results list, but it may also delete valuable information.