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On the Explore page, select the Explore option in the top left-hand corner. Then choose the option Newsletters.
Here you will find an overview of all your newsletters. These are the newsletters that have been sent, which you can filter by date. If you are looking for a specific newsletter from several months ago, use the grey search bar and the filter next to it if you wish to search by date. This filter is set to 30 days by default, which makes the search more efficient.