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There's no optimal time but maybe keep them for a year to be on the safe side. However, you have 2 other options: 1) Make sure your newsletters will look good and be readable even without the images. 2) Send your images inline inside the emails. The second option will make the email sending process heavier as it will have to attach the images inside the ...

I don't think there is an optimal time. I have never read anything about it. How about tracking the last open of a newsletter and deleting images after a month or so! I don't think anyone will be opening a newsletter after 1 or 2 months of sending it. I have a couple of newsletters and 2-3 weeks after sending is the maximum time I have seen a newsletter ...