The Smart List subscription already the ability to add an end date, but it does not include the functionality to enter a start date. The amount of time we spend calendaring the start date and then going in and activating the report is a massive burden and opens up room for error in smart list report subscription sends. Fully automating both report and smart list subscriptions is definitely something that we need!
Please also upvote the following regarding report subscription start and end dates!
https://nation.marketo.com/ideas/1390
https://nation.marketo.com/ideas/1876
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