The success of daily deal email illustrates this. Customers gain value from a ‘daily deal' email and will come to anticipate the email in their inbox every morning. Tagging links in ‘daily deal’ emails will tell you a lot about the journeys within a given customer profile, as well as about preferences and behaviours. The ultimate sell is not important – what you are doing with ‘daily deal' (or ‘weekly tips') email content is building a relationship with your customers and learning more about how journeys within your brand work. All this information is important and can be put to use on later campaigns.
People tend to think of evaluation as something you do at the end of a campaign. In fairness, doing a full evaluation at the end is a massively important part of any campaign strategy. But it’s also helpful to evaluate as you're going along. Lots of brands make the mistake of closing their ears to ongoing issues and save any feedback for the end of campaign evaluation.